Natsuki's mother remarried and had three brothers-in-law. She was kind to everyone, and it felt like she had been living here for a long time. Except she's the only one. Her third son, Ken, was too conscious of Natsuki as the opposite sex rather than her family, so he stayed in her room and avoided her. Then, one day in the early afternoon, Ken finally pushes Natsuki down. But at this time, Natsuki didn't know. That this was only the beginning of the collapse...
