Kiss×sis (stylized as kiss×sis; pronounced "kiss sis") is a Japanese manga series written and illustrated by Bow Ditama. It began serialization in Kodansha's Bessatsu Young Magazine in December 2005. It was then moved and serialized in Weekly Young Magazine from 2008 to 2009, and was serialized in Monthly Young Magazine from 2009 to 2021. Kodansha collected its chapters in twenty-five tankōbon volumes. It was adapted into an original video animation series, released from December 2008 to April 2015. A 12-episode anime television series by Feel aired from April to June 2010 on AT-X. Plot Keita Suminoe is a third-year Japanese middle school student living with his father, stepmother, and older twin stepsisters, Ako and Riko. Since the remarriage of their parents at childhood, the siblings have always been affectionately close and supportive of one another. Nowadays the trio see their opposites in a noticeably less platonic fashion; Ako and Riko frequently flirt and lust after Keita while, much to his stress, he fights the urge to give in to them. Characters Keita Suminoe is a 15-year-old third-year middle school student who is part of a blended family after his father remarried some years previously (Keita's mother having died when he was young). He was raised with two stepsisters, Ako and Riko, who are a year older than he is and have developed more-than-filial feelings for him. As a result, now that they are high school age, Keita finds it increasingly difficult to retain his modest, dignified morals; especially when exposed to his parents' shockingly permissive attitudes. A track and field club member, Keita is more athletic than he is academic; however he strives to be, and eventually is, accepted to the same high school as his stepsisters. There, he is a first-year high school student in the same class as Miharu, with Yuzuki Kiryu as their homeroom teacher. Bright and cheery, Ako Suminoe is a 16-year-old first-year high school student who is one of two stepsisters to Keita and twin sister to Riko. The more intellectual of the pair, Ako is educated, maternal, responsible, the manager of the Student Council General Affairs, skilled at cooking and homemaking, and endeavors to maintain a prim and proper demeanor. In spite of this imposing façade however, she is outwardly emotional, childish, whiny, reluctant, easily embarrassed and perverse; her most well-known open secret. Having grown up with Keita since toddlerhood, Ako is altruistic and,