Bijukubo - Season 1

Youhei resides with his mother Kaho and his cousin Fumika. Kaho unexpectedly reveals she is not his biological mother, which distresses Youhei, though she encourages him to continue their family life as before. Soon after, a woman named Ikue, identifying herself as the sister of Youhei's birth mother, becomes their neighbor. She requests that Youhei come live with her. Amid his confusion, Kaho, Fumika, and Ikue all begin to pursue him using their physical allure.