Genre: Comedy, Ecchi, Harem, Romance, School, Seinen
Original Name: Kisu×shisu
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.
Keita Suminoe is the main protagonist of the series. He is 15 years old, and is a 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 athletic more 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 General Affairs manager of the student council, skilled at cooking, 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, of course, in love with him. As such she isn’t afraid of abusing her authority on the student council to either make a pass at Keita, or cover up embarrassing occurrences.
Riko Suminoe is a 16-year-old first-year high school student and second stepsister to Keita. Though less academically accomplished than her twin, Riko is cunning, insightful, crafty, an active member of the Disciplinary Committee, and boldly open about her personal life and sexuality. Surprisingly, she cannot bring herself to kiss Keita in front of others. In contrast to Ako, she is highly skilled in physical activities and sometimes helps out with various sports clubs who need another person temporarily for training. She is known however to be soft-spoken, clumsy, temperamental, and weaker to alcohol than her sister. Riko is most recognized for wearing an adhesive bandage on her left cheek, ostensibly to cover up a scar that from when Keita threw a toy at her when they were children. There may not even be a scar, but Riko never lets anyone see what’s under the bandage. It is hinted that Riko keeps wearing a bandage as a visible reminder for Keita to keep thinking about her, Riko is ardently fond of her stepbrother and forever fighting with Ako over his affections.