Tsukasa and Rui moved into a shared house. However, Tsukasa did not know that Rui had a problem with his stress all the time and he was feeling uncomfortable. He was cutting himself because of it. no one noticed it until Tsukasa got up in the morning and saw an unhidden knife lying on the kitchen counter.

at first he thought that he forgot to put it away so he took it in his hand and put it back. but he also noticed that there were tissues covered with blood in the trash can.