Definition of Ecchi:

"Softcore hentai. Often includes panty-shots, nudity, or perverted situations. Almost always used for humor. Ecchi does not describe actual sex acts." A lot of anime fans know that ecchi is a typical theme running in more adult anime series, but combine it with romance and what do you get? You get a romantic protagonist chasing after a girl with lots of humor to ensue.  Here are the Top 15 Ecchi Anime series in no particular order! Have fun chasing after that girl! 

1. High School of the Dead

The dead began to rise and Japan was thrown into total chaos. As these monsters begin terrorizing a high school, Takashi Kimuro is forced to kill his best friend when he gets bitten and joins the ranks of the walking dead. Vowing to protect Rei Miyamoto, the girlfriend of the man he just executed, they narrowly escape their death trap of a school, only to be greeted with a society that has already fallen. Soon, Takashi and Rei band together with other students on a journey to find their family members and uncover what caused this overwhelming pandemic. Joining them is Saeko Busujima, the beautiful president of the Kendo Club; Kouta Hirano, an otaku with a fetish for firearms; Saya Takagi, the daughter of an influential politician; and Shizuka Marikawa, their hot school nurse. 
 

2. High School DxD

High school student Issei Hyoudou is your run-of-the-mill pervert who does nothing productive with his life, peeping on women and dreaming of having his own harem one day. Things seem to be looking up for Issei when a beautiful girl asks him out on a date, although she turns out to be a fallen angel who brutally kills him! However, he gets a second chance at life when beautiful senior student Rias Gremory, who is a top-class devil, revives him as her servant, recruiting Issei into the ranks of the school's Occult Research club. Slowly adjusting to his new life, Issei must train and fight in order to survive in the violent world of angels and devils. Each new adventure leads to many hilarious (and risqué) moments with his new comrades, all the while keeping his new life a secret from his friends and family in High School DxD!

3. Infinite Stratos

An exoskeleton weapon engineered by Japan, Infinite Stratos (IS) can be piloted only by women. Its power and combat prowess are so immense that an international treaty has been signed banning its use as a military asset. When it is discovered that 15-year-old Ichika Orimura is the only male capable of steering an IS, he is forcibly enrolled in the Infinite Stratos Academy: an all-female boarding school, the students of which graduate to become IS pilots.

At this training school, Ichika is reunited with two of his childhood friends, Houki Shinonono and Lingyin Huang, and befriends Cecilia Alcott, an IS representative from the United Kingdom. Guided by the legendary pilot Chifuyu Orimura—their strict homeroom teacher and Ichika's older sister—Ichika and the girls will need to use everything at their disposal to defend themselves and their academy against the dangers that will arise during the course of their thrilling school life.

4. Kanonkon

Kouta has girl troubles of the supernatural sort. For some reason, he keeps attracting the attention (and affections) of animal spirits!

Having spent most of his life in the country, Kouta is understandably nervous when he moves in with his grandma to attend a high school in the big city. He hoped to make a good impression, but having Chizuru, a beautiful fox spirit, hanging off his arm didn't seem to be the sort of image he wanted to have. She's not alone in her love for Kouta, either. Nozomu, a wolf spirit, as well as other youkai have their sights set on the hapless country boy. 

5. Kiss x Sis

After his single father gets remarried, Keita Suminoe not only finds himself with a new mother, but also two beautiful twin step-sisters, Ako and Riko. Their close bond as children soon grows into something more personal, and Keita finds himself in a real bind that he vigorously struggles to escape from.For the twins, the transition from little girls to teenagers brought about changes in appearance as well as emotional growth. Their love for Keita became something more than brotherly love, as they were both overcome with romantic feelings and pure lust.

These innocent girls, being a couple of honest young ladies, could not help but confess their newborn love to their poor little brother. Hilarity ensues as Keita, who refuses to see the two as anything other than his sisters, then starts getting into embarrassing, sensual and lustful situations with them. Will Keita cross the line of incest or will he be able to protect his family jewels?

6. Sekirei

Struggling yet brilliant teenager Minato Sahashi has failed his college entrance exams for the second time, resulting in him being regarded as worthless by those around him. However, the course of his seemingly bleak future is altered dramatically when a beautiful, supernatural woman falls from the sky and into his life. That woman, Musubi, is a unique being known as a "Sekirei," a humanoid extraterrestrial with extraordinary abilities. These aliens are known for kissing humans carrying the Ashikabi gene in order to awaken additional latent powers deep within. Recognizing the potential within the seemingly insignificant youth, Musubi kisses the bewildered Minato, initiating a bond between the two of them. This drags him into the high-stakes world of the Sekirei, where he and his new partner must compete against others in a battle for survival called the "Sekirei Plan." However, unbeknownst to the contestants, there is far more at risk that what the competition initially entailed.

7. Shuffle

In present times, Gods and Demons coexist together with Humans after the door between each of these worlds had opened. Tsuchimi Rin is a normal young high school student attending Verbena Academy, spending his days living peacefully with his childhood friend Kaede. Unexpectedly, one day the King of Gods, the King of Demons and their families move into be Rin's next door neighbors. Apparently the daughter of the Gods, Sia, and the daughter of the demons, Nerine, are both deeply in love with Rin after having met him in the past. Along with his playful friendship with upperclassmen Asa and his encounter with the silent but cute Primula, Rin has much on his hands dealing with the affections of each of these girls.

Based on the eroge by Navel.

8. To Love Ru

Timid 16-year-old Rito Yuuki has yet to profess his love to Haruna Sairenji—a classmate and object of his infatuation since junior high. Sadly, his situation becomes even more challenging when one night, a mysterious, stark-naked girl crash-lands right on top of a bathing Rito.
To add to the confusion, Rito discovers that the girl, Lala Satalin Deviluke, is the crown princess of an alien empire and has run away from her home. Despite her position as the heiress to the most dominant power in the entire galaxy, Lala is surprisingly more than willing to marry the decidedly average Rito in order to avoid an unwanted political marriage.

9. Yosuga No Sora

Tragically orphaned by an automobile accident, the Kasugano twins travel to their grandparents' countryside residence via railcar, hoping to reconstruct the shards of a shattered life. Two lonely souls so physically alike, yet spiritually divergent, they are unaware of the challenges these conflicting expectations will unveil in the days to come. Uncertain of the future, Haruka Kasugano clings to memories of the past, hoping to find the strength he needs to protect his ailing sister. As the story develops, it tells four stories, each with one girl; rich but kind, polite but sad, depressed but hopeful, and petite but fierce.

10. Aki Sora (Autumn Sky)

Ever since he was a young child, Sora Aoi had always exchanged words of "I love you" with his attractive older sister Aki. Now, as he comes of age, he finds it much harder to exchange such comforts as they did in those simpler times. When Aki demonstrates her feelings toward him to go beyond a sister's love, Sora finds himself questioning his feelings for his sister. Realizing their affection for one another, they consummate their love in secret. In a society that would never understand, they must now keep their love a secret from their family and everyone they know. However, Sora soon finds himself exploring many forms of love with different kinds of women he met that is not accepted by society thus questioning his feelings for his sister.

11. Bakemonogatari (Ghostory)

Koyomi Araragi, a third-year high school student, manages to survive a vampire attack with the help of Meme Oshino, a strange man residing in an abandoned building. Though being saved from vampirism and now a human again, several side effects such as superhuman healing abilities and enhanced vision still remain. Regardless, Araragi tries to live the life of a normal student, with the help of his friend and the class president, Tsubasa Hanekawa. When fellow classmate Hitagi Senjougahara falls down the stairs and is caught by Araragi, the boy realizes that the girl is unnaturally weightless. Despite Senjougahara's protests, Araragi insists he help her, deciding to enlist the aid of Oshino, the very man who had once helped him with his own predicament. Through several tales involving demons and gods, Bakemonogatari follows Araragi as he attempts to help those who suffer from supernatural maladies.

12. Kuttsuki Boshi (Stars Intertwined)

To Kiiko Kawakami, there was nothing in the world as important to her as Aaya Saitou. Something about her allured Kiiko to the extent that there was no sound sweeter to her ears than Aaya's voice and no sight more beautiful than her hair softly billowing in the wind. It was for that reason she let Aaya in on her secret: last year, she had gained psychic powers from an accident that changed her life. Kuttsukiboshi is a story of infatuation and romance between two girls as their feelings for one another reach the tipping point. Unable to deny their heartfelt desires, the two give into them and make many sweet memories together around the school—testing the bounds of Kiiko's powers and how far they can go without being caught in the midst of their trysts. 
 

13. Shomin Sample

Kimito Kagurazaka is a commoner with a fetish for men's muscles—or at least that's the lie he must keep telling if he wants to keep himself out of trouble at the elite all-girls school, Seikain Academy. Kidnapped by the school under the assumption that he prefers men, Kimito is made to be their "commoner sample," xposing the girls to both commoner and man so that the transition to the world after school is not jarring. Threatened with castration should his sexual preferences not match the school's assumptions, Kimito keeps up the facade to protect his manhood. But there are eccentric individuals around every corner who begin to make Kimito's life even more difficult.

Among them are Aika Tenkuubashi, a social outcast who blurts out whatever comes to mind; Hakua Shiodome, a young genius; Karen Jinryou, the daughter of samurai who is obsessed with defeating Kimito; and Reiko Arisugawa, the perfect student who has delusions of marrying Kimito. Along with the commoner himself, these four girls make up the Commoner Club, which attempts to teach the girls more about life outside the school, while Kimito gradually learns about the odd girls surrounding him.

14. The Testament of Sister New Devil

Basara Tōjō is a high school student studying at Hijirigasaka Academy when his father Jin suddenly gets "remarried" and asks Basara if he wants to have sisters. Basara meets his two cute stepsisters, Mio Naruse and Maria Naruse. After his father departs overseas, Basara quickly finds that the two sisters are actually part of a demon clan, and he is meant to be with the hero clan. Mio, a Demon princess, forcibly attempts to make a master and servant contract with Basara, but Maria has it end up being the opposite. Basara is then always getting into ecchi scenarios, more the while, to protect Mio from being pursued by other demons who are after her heritage passed down by the former Demon Lord Wilbert.

15. Zero no Tsukaima (The Familiar of Zero)

Louise is a noble girl who is terrible at magic, as her attempts usually result in an explosion. She is nicknamed "Louise the Zero" by her classmates, due to the inability to use any of the four magic elements. Early in the school year at the Tristain Academy of Magic, the second year students perform a special ritual where they summon their familiar, which serves as their eternal protector and partner, and is usually some sort of magical creature. But Louise summons Saito Hiraga, an ordinary teenage boy from Japan, leaving her totally humiliated.

Due to the sacredness of the ritual, Louise reluctantly accepts Saito as her familiar, but proceeds to treat Saito as any other familiar, only worse, making him wash her clothes, sleep on a bed of hay, and whipping him with a riding crop for little or no reason. The Familiar of Zero follows the adventures of Louise and Saito as they help their classmates and friends, while occasionally blundering into situations where they risk their lives to save one another. Saito tries to find a way to get back to Japan, but he also has a mysterious power that allows him to wield swords and other weapons to perform heroic feats. They also eventually learn the truth behind Louise's magic inabilities. As Saito's and Louise's friendship grows and they start to work together, they ultimately fall in love with each other.

Best Ecchi Anime Couples

In anime, ecchi is a genre with sexually provocative themes and visuals, and humor and scenes based around innuendos. Ecchi is still subtle enough for television but does linger on the perverse side of life.

There are some great ecchi anime couples out there, full of ecchi romance!

Hajimete no Gal

The couple to watch in Hajimete no Gal is Juinchi and Yame. Juinichi is in his second year in high school and is ready for some loving. The problem with this is that he and his friends are pretty much losers. They all spend their time fantasizing about their dream girl until it is no longer a dream for Juinichi. He somehow lands a date with Yame, the hottest girl in school. He immediately wants to get into her pants, but soon realizes there is more to her than just sex.

Yame is incredibly attractive, almost a sex goddess, but in actuality, she is a virgin who wants someone who can treat her right. While Juinichi isn’t that guy at first, the two soon develop a relationship with some sexuality to it, but with growing respect on how to treat the opposite sex.

Rosario to Vampire

Through a strange and humorous series of events, Tsukune manages to be accepted into Yukai Academy, and little does he know at first, but it is a school for monsters. At the Academy, the first rule is to never reveal your monster form. Tsukune meets Moka, a clueless vampire who does not actually know about this rule.

Tsukune’s human scent attracts every student in the school, and that includes Moka. At first, she is only attracted to him for the smell of his blood, but he truly does fall in love with her. Tsukune saves her life a couple of times, and Moka begins to develop feelings for him. The catch is that if he breaks the rosary on her neck, she will become a true vampire and kill whoever threatens him.

It might seem like a basic love story at first, but it is full of panty shots and censored scenes that add the ecchi into this loveable, unusual couple.

Rakudai Kishi no Cavalry

Ikki attends Hagun Academy, where he is considered the worst mage of all. He moves into his dorm room but accidentally opens the door to find his female roommate, Stella Vermillion, changing. To make things interesting, she turns out to be the strongest mage at the academy.

The two do not get along in the beginning, but Stella does come around to agree to help Ikki better his magecraft. Eventually, the two become a couple with a strong bond between them. Stella’s family is royalty, and they look down on Ikki, who was outcast by his higher class relatives. Her family does whatever they can to keep Ikki away from Stella, but the two try everything possible to stay together.

This anime has sweet moments perfectly tied in with some innuendo humor to spice things up.