15+ Best Borderline Hentai Anime (Recommendations)

There are a variety of genres in Japanese anime such as Shounen, Shoujo, Seinen, Etc. And these genres are further divided into many sub-genres. Some such subgenres are ecchi and isekai. These two subgenres have gotten especially popular among fans in recent years.

Ecchi anime are usually anime that have tons of fan service, but there are certain anime that push the limits of fan service and sometimes it makes you doubt yourself as to whether you’re actually watching a hentai and not an anime. These anime are commonly referred to as “Borderline Hentai Anime” in the anime world.

Today, we’ll be listing 16 of such anime. So without further ado, let’s begin with the 15+ Best Borderline Hentai Anime (Recommendations)

Best Borderline Hentai Anime

15. Kiss x Sis

After Keita Suminoe’s mother died, his father remarried, bringing two step-sisters into his life: twins Ako and Riko. But, since their fateful first meeting, the girls have been overcome by an incestuous love for their younger brother, sparking a lifelong feud for his heart.

Keita, who is nearing the end of his middle school career, studies hard in order to attend Ako and Riko’s high school. While doing so, he must reconcile his conflicting feelings for his siblings and decide whether to reject or accept his sisters’ intimate advances. Unfortunately for Keita, his sisters aren’t the only women lusting after him, and there’s no telling when the allure of temptation will get the better of him as well.

14. Why the Hell are You Here, Teacher!?

Ichirou Satou, a second-year high school student, has always been an average person—that is, until he encounters some not-so-average situations with his teacher, Kana “The Demon” Kojima. Satou’s Japanese language teacher, Kojima, is known for being so ruthless that even school delinquents bow down to her. When Satou runs into Kojima in the restroom one fateful day, they share an intimate encounter that leaves his imagination running wild for days.

Why the Hell are You Here, Teacher!?
follows the daily life of Satou and his teacher as they continue to meet under similar conditions, growing ever closer with each encounter.

13. Redo of Healer

When Keyaru gained his abilities as a Hero who specialized in healing all injuries regardless of severity, it appeared that he would have a bright future. Instead, he faced excruciating agony as he was subjected to years of seemingly endless hellish torture and abuse. Keyaru’s healing abilities allowed him to secretly collect the memories and abilities of those he treated, gradually strengthening him to the point where he was stronger than anyone else. But it was far too late by the time he realized his full potential—he had already lost everything.

Keyaru, determined to get his life back on track, cast a powerful healing spell that rewound the entire world back to before he began to suffer his terrible fate. With the anguish of his past at his disposal, he vows to redo everything in order to fulfill a new purpose—to exact revenge on those who have wronged him.

12. High School DxD

Issei Hyoudou, a high school student, is your typical pervert who spends his days peeping on women and fantasizing about having his own harem one day. When a beautiful girl asks Issei out on a date, things appear to be looking up for him, but she turns out to be a fallen angel who brutally kills him! However, he is given a second chance at life when beautiful senior student Rias Gremory, a top-class devil, resurrects him as her servant, recruiting Issei into the school’s Occult Research club.

Issei must train and fight to survive in the violent world of angels and devils as he slowly adjusts to his new life. Each new adventure leads to many hilarious (and risqué) moments with his new comrades, all while keeping his new life a secret from his High School DxD friends and family!

11. Testament of Sister New Devil

Basara Toujou learns the hard way that running into your new stepsister in the bathroom is not the best way to make a good first impression. When his father unexpectedly brings home two beautiful girls and introduces them as his new siblings, he is forced to accept the Naruse sisters, busty redhead Mio and petite silver-haired Maria, into his family.

Basara is forced to reveal himself as a former member of a clan of “Heroes,” sworn enemies of the demons when these seemingly normal girls reveal themselves as demons—Mio, the former Demon Lord’s only daughter, and Maria, her trusted succubus servant. Basara, on the other hand, having begun to care for his new sisters, decides to protect them with his powers and forms a master-servant contract with Mio to keep watch over her.

Basara must do the impossible to protect his new family members, with the Heroes watching his every move and the constant threat of hostile demons. Furthermore, the protector is concealing his own dark secret, which haunts him to this day…

10. Prison School

Hachimitsu Private Academy, located on the outskirts of Tokyo, is a prestigious all-girls boarding school known for its high-quality education and disciplined students. This is about to change, thanks to a revision of the school’s most famous policy, which allows boys to enroll as well.

At the start of the first semester under this new decree, only five boys were accepted, effectively dividing the student body into two hundred girls to one boy. Kiyoshi, Gakuto, Shingo, Andre, and Jo are quickly dismissed without a chance to make a first impression. Unable to communicate with their female classmates, the eager boys embarked on a far more dangerous mission: peeping into the girls’ bath!

The motley crew’s freedom is abruptly taken away after their plan is thoroughly decimated by the infamous Underground Student Council, as they are thrown into the school’s prison with the sentence of an entire month as punishment. Thus begins the story of the boys’ harsh lives in Prison School, a righteous struggle that will eventually put friendship and perverted brotherhood to the test.

9. Interspecies Reviewers

The world is home to a plethora of different races, ranging from perky fairies to oozing slimes. Naturally, such a diverse collection of creatures has a wide and enticing range of brothels. With so many options, it’s difficult to choose which succu-girl to have a meaningful, interpersonal experience with.

Fortunately, a small band of brave warriors has banded together to educate the public. Through hands-on research, these perverted adventurers assess the appeal of various types of succu-girls. The Yoruno Gloss reviewers leave no species behind, whether it’s the scorchingly hot salamanders or the udderly hu-moo-ngous cow-girls.

Interspecies Reviewers, directed by the man behind Miru Tights, seeks to answer one of the most pressing questions: which species is the sexiest?

8. Gantz

Did you think your life was bad? Death can be worse at times. There is no salvation, no peace, and no god waiting to take you into their care. But wait a minute, a god? Perhaps you’re referring to the large black ball that has become trapped in the room with you. Now you’re trapped in a game, fighting green aliens and robot monsters for your life.

When Kei Kurono is killed, he finds himself in the middle of such a game—a test of his abilities, morals, and will to live. His life is not his own; his death is spat upon and trampled on repeatedly. What if he refuses to listen? God only knows.

A word of caution: Gantz is not for the faint of heart, nor is it as simple as it appears. Gore, rape, and violence are prevalent, as are depictions of greed, violence, and all of society’s ugliness.

7. World End Harem

Reito Mizuhara is a medical student at Tokyo’s National Advanced Medical School who suffers from cellular sclerosis, a rare and fatal disease. He is placed in cryogenic sleep for five years in order to be treated. When he awakens, he discovers that a year into his slumber, a worldwide pandemic had broken out, caused by the novel Male Killer (MK) virus, which only affects males and has killed all other men on Earth.

Reito and four other men were fortunately spared during their cryosleep and are now immune to the virus. As the only men left on the planet, they must mate with as many women as possible in order to repopulate the planet. Reito, on the other hand, is devoted to his childhood friend and sole love interest, Elisa Tachibana—only to discover that she went missing three years ago. While the other male survivors adjust to their new surroundings, Reito chooses to pursue Elisa, fight never-ending temptation, and investigate the mysterious virus.

6. Sekirei

Minato Sahashi, a struggling yet brilliant 19-year-old, has failed his college entrance exams for the second time, rendering him worthless in the eyes of those around him. However, when a beautiful, supernatural woman falls from the sky and into his life, the course of his seemingly bleak future is dramatically altered. Musubi is a one-of-a-kind being known as a “Sekirei,” a humanoid extraterrestrial with extraordinary abilities. These aliens are known for kissing humans with the Ashikabi gene to awaken additional latent powers deep within.

Recognizing the potential in the seemingly insignificant youth, Musubi kisses the befuddled Minato, forming a bond between them. This propels him into the high-stakes world of the Sekirei, where he and his new partner must compete against others in a survival battle known as the “Sekirei Plan.” However, the contestants are unaware that there is far more at stake than what the competition initially entailed.

5. Hybrid × Heart Magias Academy Ataraxia

Hida Kizuna has the HHG (Heart Hybrid Gear) ability, but it isn’t powerful enough to make him particularly useful. His older sister summons him to a strategic defense school, where many of the students (many of whom are large-breasted girls) use their HHG abilities to fight invaders from another world while dressed in extremely skimpy pilot outfits. Kizuna’s fighting ability isn’t up to par, but his sister has a different plan: having erotic experiences with Kizuna will apparently allow the girls to replenish their energy or power up. It appears that his new school life will be full of embarrassment.

4. Monster Musume: Everyday Life With Monster Girls

Kimihito Kurusu lived a quiet, unremarkable life alone while his parents were away until monster girls crowded in! This alternate reality depicts cutting-edge Japan, the first country to promote non-human species integration into society. Kimihito quickly attracts girls of various breeds after the incompetence of interspecies exchange coordinator Agent Smith leaves him as the homestay caretaker of a Lamia named Miia, resulting in an ever-growing harem flush with eroticism and attraction.

Unfortunately for him and the ladies, the Interspecies Exchange Act prohibits sexual interactions between species! The only exception is an experimental marriage provision. As the passionate, affectionate, and lustful women hound his every move, seeking his romantic and sexual affections, Kimihito’s life becomes fraught with an abundance of creature-specific caveats and sensitive interspecies law. With new species appearing all the time and events seemingly appearing out of nowhere, where Kimihito and his harem end up is anyone’s guess!

3. Harem in the Labyrinth of Another World

Michio Kaga, a high school student, attempts to launch a strange online game he discovered while browsing the internet one day. Instead, he is transported to a rural village in the game’s world, where he is given special abilities and a powerful sword. After gathering his thoughts, he finds himself fighting bandits and quickly realizes that he cannot log out. Michio, resigning himself to fate and accepting this reality, embarks on a journey to enjoy his new life, conquer dungeons for money, and build a harem to satisfy all his manly desires.

2. Yosuga no Sora

Haruka and Sora Kasugano have lost both of their parents in a tragic accident. Starting over, they return to their childhood home, living in the rural, quaint town they left four years ago.

Returning to such a nostalgic location, however, entails recalling all of the memories the two of them shared, whether they brought them blissful joy or painful sorrow. Meeting both old and new friends, the story of Haruka and Sora becomes increasingly complicated as their lives are gradually influenced by various acts of love, friendship, envy—and perhaps even lust.

1. To LOVE-Ru Darkness

Close encounters of the twisted kind continue to escalate between the residents of the planet Develuke (represented primarily by the female members of the royal family) and the inhabitants of Earth (represented primarily by one very exhausted Rito Yuki). Things SHOULD be smooth sailing for junior princesses Nana and Momo when they transferred to Earth School, where big sister LaLa can (theoretically) keep an eye on them. But when Momo decides to “supplement” Rito’s relationship with LaLa with some “sisterly love,” you know LaLa isn’t going to waste time splitting harems.

Unfortunately, Yami, the Golden Darkness, appears on the scene with all the subtlety of a supernova, accompanied by an army of possessed high school students! All of this is bound to make Rito’s life as bad as a black hole at the family picnic. Unless, of course, a certain semi-demonic princess can apply a little Develukean Whoop Ass to precisely that portion of other heavenly bodies!

BONUS: Immoral Guild

Kikuru Madan, is a monster hunter with excellent performance, because of his particular job in the forest, but he decided to quit it because of his fear of wasting his own youth… but to quit his current job, he must train some new recruits with questionable abilities so as to not leave the town unprotected. But, to his surprise instead of helping Kikuru with the monster hunting, they keep getting attacked by monsters, although, in a different way…

That was it for the list, let us know what’s your favorite questionable anime from this list in the comments below!