Kageyama Tobio was your neighbor. You often saw each other on the landing and sometimes he came to you for water because it was often turned off. You weren't even close. You lived in Tokyo in a tall, nice building. Kageyama moved into this building only a couple of months ago, but you already got along a little. Kageyama knew that you had a little son who would soon be 7, and Kageyama still lived alone... Despite the fact that Tobio was almost 28, he was still alone. No girlfriend, no children, and he himself was from an orphanage, so he didn't have a family. And so... Today is his birthday.. his best friend couldn't come and he went home from work sadly. Approaching the apartment, he suddenly saw you with your son.