16 (as of Chapter 54)
|Eye Color||Egyptian Blue|
|Birthday||May 5th (Taurus)|
|Relatives|| Mr. Suminoe (father)|
Mrs. Suminoe (step-mother)
Ako Suminoe (step-sister)
Riko Suminoe (step-sister)
|Manga Debut||Vol. 1, Ch. 0|
|Anime Debut||Ep 1, OVA 0|
|Voiced By||Ken Takeuchi|
Keita Suminoe (住之江 圭太, Suminoe Keita) is a 16 year old first-year high school student. He is Riko and Ako's step-brother (not blood-related). He is also one of the main characters of the series. Yuzuki Kiryu is her girlfriend and they fantasizes to have sex in their future. They love each other really much.
Keita has prussian blue hair, which he wears in a spiky style. His eyes are egyptian blue, similar to his hair color but slightly darker. As a former track and field club member he has an athletic body.
Although he is the younger (step) brother of Ako and Riko, he is the most mature of the three siblings. Though he is depicted as also the most childish one when younger. Keita is shown to be athletic more than he is academic, meaning academically he doesn't do as well as Ako but, he does much better than Riko, who has the poorest grades among the three siblings. Keita also mentioned that he is the healthiest person among his friends and that his performance in athletics will help him get admitted into high school.
Though initially annoyed by his sisters' antics, Keita studied hard to enter same high school as his stepsisters due to his love of them and desire to not leave them lonely.
He has strong morals (that have clearly weakened with the constant “attacks” his sisters have done throughout the series), and he will try to resist the best he can, but he will simply indulge in the moment if pushed too far. He has a great deal of brotherly love toward his sisters as he not only stands up to his classmates when they start murmuring about their apparent "incestuous relationship" but also twice to the P.E. teacher.
While at first he initially dislikes himself for becoming attracted to Ako and Riko, he later becomes proactive in his desires. It is later revealed he was in love with his sisters when they were kids and even used all of his money for a prayer so that he could marry both of them. He lost his infatuation with his sister, essentially "growing up", when he found out from his father that polygamy is illegal. Keita is weak to alcohol, and while he becomes livelier when drunk he does not remember anything when he sobers up, but when he gets drunk again his memories come back to him.
Mr. Suminoe - His father by blood, he and Keita spend most of the time yelling at each other. Though an annoyance to Keita he does love and respect his father even if he does have a less than mature attitude toward most things. On the rare occasions it's offered, Keita will listen to and act on his fatherly advice.
Mrs. Suminoe - Though they do not interact that much, it is assumed that he loves his step-mother.
Ako Suminoe - His eldest sister, Keita loves Ako very much. He is very appreciative of her homemaker skills and loves her cooking the most. Ako is half the reason he decides to go to Tamahide High School. Keita usually asks Ako for help with his homework due to her superior grades. Keita tends to go to Ako first when it comes to apologizing, kissing, etc. Keita is very protective of her, he is scared of her to dating someone he doesn't know and doesn't want anyone to see her in lingerie but him.
Riko Suminoe - The younger of his older sisters. Keita loves her very much. Riko is a lot more open to do sexual things with Keita than her sister. Riko is the other reason why Keita chose to go to Tamahide High School. He knows about her anxieties and was willing to put aside their differences during a fight to help her improve her "exhibitionist skills" so that she could help out the gymnastics club. He enjoys turning the tables and physically dominating her after she has turned him on. Keita is very protective of her, he is scared of her to dating someone he doesn't know and doesn't want anyone to see her in lingerie but him.
Toda Edogawa - One of the few male students Keita associates with, Toda is Keita's best male friend. Keita often gets annoyed when Toda assumes what it's like at Keita's house. Toda called Keita to check and see if he passed the entrance exam and Keita allowed Toda to stay over his house when he claimed to be running away showing that even though they butt heads there is still a good amount of camaraderie between them.
Miharu Mikuni - One of Keita's classmates, Miharu is a shy girl who he first met when she returned his entrance exam results. Though initially strangers, he and "Mikuni", as he calls her, have grown close to each other. Keita always tries to consider Miharu's feelings after any awkward situation with her; he defends her when his sisters claim she was aiming to be alone with him in the p.e. storage room, and even carries her during a find-a-person race during the track and field day teaching her what first place feels like. Keita has a growing attraction to Miharu starting from when they almost kiss in the p.e. storage room, he later has a sexual fantasy of her while masturbating. Keita notes that Miharu has opened up more to people and has more friends than she used to in middle school.
Yūzuki Kiryū - His homeroom teacher at Tamahide High School, Keita's relationship with "Kiryū-sensei" started off rather sour. He first met Yūzuki in a department store prior to her becoming a teacher. Recognizing her as the department store clerk during his entrance ceremony he nervously wondered if she remembered his incident at the store. Before long he had a noticed growing attraction to her; he later admitted to her that he wanted to have sex with her during the summer festival. He was saddened and hurt when she got angry with him about this revelation and even asked her to call him "Keita-kun" again after she stopped. During the typhoon the two shared their first kiss, which may have extended into intimacy had the blackout not ended. After a date at school Keita asked Yūzuki out and the two have officially become a couple. They continuously fantasize about each other, and plan to have sex in the future. Keita cares enough for their relationship to apologize beforehand to Yūzuki whenever he and his sister do anything sexual, like the tapioca swap game, even going so far as to hide from their kisses when he first started dating Yūzuki.
Mikazuki Kiryū - His junior by one year, Mikazuki is a rival for Keita's affection. Keita shows little interest in her when she's not attempting to seduce him and sees her more as a friend.
Keita was initially introduced as a third-year junior-high school student (equivalent to a ninth grader). As a former track and field club member, Keita was originally planning on relying on his track scholarship for another school. He later changes his mind and begins to study to test into his sisters' high school, after they come to his school and confess their love for him. After chapter 18 of the manga, he makes it into his sisters’ school, Gakushū Senior High. In chapter 54 it was his 16th birthday but it wasn't acknowledged by his parents until chapter 75. As of chapter 67 Keita and Yūzuki have officially become a couple after their first date.
- Keita stopped believing in God when he found out polygamy was illegal.
- He seems to have a tongue fetish.
- Keita's penis is shown to be large, big enough for both Ako and Riko to grab with one hand each.
- One of the running gags of the series is that he can easily be pushed into doing something he doesn't want to do.
- In the manga whenever someone imagines him he's drawn with manlier or demonistic features.
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