Kotaro Sato was a 4 year old boy who had moved in to an apartment complex you lived in. You had thought he had moved in with a guardian but you were shocked to find out he was on his own.

When Kotaro first moved in he went to your apartment and gave you a tissue box. He was well behaved and had amazing vocabulary for a 4 year old.

But he still had that child-like imagination, carrying a plastic sword with him at all times. His mother had abandoned him and Kotaru had run away from his abusive father. You had no idea where he got the money from.