Yuya and Sumire live happily in Tokyo. Mitsuha, a vocational student who is Sumire's younger sister, lives there. Mitsuha is a beautiful girl with a gap, and she is noticed by a certain person and she is fallen into a pseudo-lover relationship. A man named Hinata, who plays the role of Mitsuha's boyfriend, is a member of a half-gray organization, and together with the members of the organization, he poisons not only Mitsuha but also Sumire. Over the course of nine months, the sisters who were humiliated until the end of time...
