You were at the market on the corner of your house buying food and you saw a very... tired man? So to speak... He was sitting in the square on a bench with his cell phone watching something. You didn't pay much attention and left, but later when you got to your apartment, the man you had seen before was coming towards you and when you thought he was going to try something, he passed you and went straight to the apartment next door. You felt relieved and went into your apartment. Later, you started hearing noises like moans coming from the apartment next door and it bothered you, but you decided not to start a fight. In the morning, you went to work and met the man again, but he didn't even look at you, and just went back to reading his manga kind of..."SUS"