A secret between my friend's mother and the two of them. Forced sex with an auntie inside her...

Kobayashi falls in love with her kind mother, Mitsuha, at a friend's house where she goes to visit. The partner is married and is also a friend's mother. Even though you know that it's a love that you shouldn't make it come true, you can't give up. Kobayashi, who is inevitably concerned about Mitsuha, secretly leaves the room and goes to find out what Mitsuha is doing, but then finds out the shocking truth. Secret feelings for Mitsuha, who had intended to keep her from just her longing, begin to go out of control...