Kiss x Sis

Keita Suminoe's life changes after his father remarries, introducing him to two step-sisters, Ako and Riko. Ako is a mature and responsible former student council president, while Riko is an athletic and independent individual who previously served as disciplinary president. Keita's relationship with both sisters is close due to their shared childhood, but it develops into a complicated romantic and erotic dynamic as they enter adolescence. As a result, Keita must balance his studies and fend off his sisters' advances, all while navigating their parent's approval of Ako and Riko as potential wives.