ATID-374 In the family, the gang rape was abused by the stepbrother.

After the mother remarried, there were three stepbrothers, and all of them were gentle, as they had been living together... and even felt that way, except for one man who didn't think of Natsuki as his family, but hid in his room as a person of the opposite sex, and then, one day at noon, Ken finally pushed him down, but summer had no idea that this was the starting point of the collapse...