What Going On With My Sister

What Going On With My Sister is a funny love and 18+ of Japan, begins with the girl name Mitsuki (Tenka Hashimoto) and the guy name Yuya (Yukichi Kobayashi), suddenly becoming sisters because of their parents’ remarriage as stepchildren. Mitsuki cannot integrate into her new family while Yuya does not know how to approach his beautiful new sister.

One day, Mitsuki is possessed by the spirit of Hiyori (Mayu), a girl who has liked Yuya for a long time but has not had time to confess and she believes that Yuya is the one who can help her go to heaven. When Mitsuki knows that someone is controlling her and wants to do “that” with her younger brother Yuya, she is very surprised and scared, so she thinks of a way to put a chastity belt lock to avoid unfortunate things from happening.

Unable to carry out the plan as desired, Hiyori told the truth to Mitsuki, from there the two began to plan to bring Hiyori in different ways, not necessarily using Yuya, the two even tried to use Mitsuki himself by creating feelings for each other but failed, that’s why things became more and more deadlocked, however, after many events happened, Mitsuki began to develop feelings for Yuya… a love affair between two sisters…