Noah agrees to live in his dream Japanese house for a month on the condition that he communicates with the homeowner, who is a hikikomori (recluse). Noah wonders what kind of person he is, but what appears before him is Kei, a taciturn and expressionless young man who is like a cat who is not used to people.
Noah had hoped to get by with minimal interaction, but he finds himself unable to leave Kei alone, as he is in such a dangerous situation that he can't believe he's been living alone.
Even when I went out at night, I was worried about Kei... When Noah came home late at night and checked on Kei, he heard a seductive voice...!?