[R +18] Kiss X Sis

Keita is living many junior high school boys' dream. He has two older step twin sisters who compete for his romantic love in so many ecchi ways: good morning kisses and panty flashing. Their parents openly support the sisters' feelings and advances because they are step-siblings and are not related by blood, in fact they even have a bet going as to which sister Keita will accept. Now, if only the sisters were not so popular, because they have asked their little brother to attend their high school where there are certain to be problems.

Characters:
Suminoe, Keita [Main] - Keita is a third-year junior-high school student studying for his high school entrance exams and although he is the younger brother, it is obvious he is the most mature of the three siblings. He wants to enter the same high school as his older twin step-sisters Ako and Riko, and to do so must study hard while getting help from his sisters as well as he was originally planning on relying on his track running scholarship for another school.

Suminoe, Ako [Main] - Ako is the elder twin sister. A way to tell her apart from Riko is that she wears a hair clip to keep the hair off her forehead. She has a reliable, level-headed personality, but can be sullen, moody, even a bit childish and is quickly embarrassed.

Suminoe, Riko [Main] - Riko is the younger twin sister. A way to tell her apart from Ako is that she wears her hair in a ponytail, and it is longer than her sister's hair. Also, she has a bandage below her left eye.

Mikuni, Miharu - A teenage girl that was introduced in chapter 18 where she returned Keita's acceptance letter when she found her dog trying to bury it in her yard. Out of a combination of stress from believing he did not get in to the relief he found out he did get in, Keita hugs her out of the blue. After that action she has shown an attraction towards Keita, often blushing when they talk and feeling very comfortable when he hugs her, but overall states she has nothing to do with him.

Kiryuu, Yuuzuki - She is Mikazuki's older sister, the new teacher to Gakushū Senior High and homeroom teacher to Keita and Miharu, who in an earlier chapter was a clothing store clerk because she liked western style clothing. Through bad timing and unaware that Keita and his sisters are not related by blood, she believes that he is a deviant who dates multiple girls while having an incestuous relationship with his sisters.

Kiryuu, Mikazuki - She is an underclassman that is "chasing after him (Keita)". They were in the same sports club back at his old school. She is even more perverted than Ako and Riko when it comes to getting Keita's attention, with no qualms of flashing her privates at him in front of others.