親の再婚で妹になった学園のアイドルが、家ではとんでもない不良娘だった。 (Associated Names)

Kasai Yuuto’s school life was one of solitude. A little after entering his second year of high school, his parent’s sudden remarriage resulted in him getting a new stepsister who was around his age. That stepsister turned out to be none other than his classmate who sat next to him, the school’s idol, Hina Saijou.…