The TV anime series Kiss x Sis follows the earlier OVA adaptation based on Bow Ditama's manga about sisterly love. And not just any kind of sisterly love, but a double step-sisterly love. The original "romantic incest comedy" manga centers on Keita - a third-year middle school boy studying for his high school entrance exams. His two twin stepsisters Ako and Riko Suminoe - with no blood relation to him - help him prepare for the exams, but life gets too cozy between Keita and the girls.