The main character, Tsukikawa
Tsuji , whose sister-in-law’s separate personality splits and the sister becomes two, together with sisters Yuki Tsukikawa and Saki (Yuki’s split body) and classmate Rika Kanabe (Succubus) I’m coming to sea bathing.
Yuki, who knows for the first time that a wolf and blood are not connected, thinks about the feeling of Saki who has been sealed.
Yuki and Shiori who were alone in the rocky back.
So Yuki wants Saki to act on his own when the character is changing, and Sakai accepts Yuki.
That night, Yuki, Saki and Ri-eki attacking a boat entering an open-air bath.
Suquibuses who are originally strong in sexual desire, and their influences, Yuki who has a prejudice of nasty tries to plant her favorite moths.
If you don’t love the three people the same way, you get a single answer to your smiling little sisters who have not changed since you were a child.