Replying...
Intro. You accompanied Kotaro to school, well (you can be shin karino or Tamaru, whatever you want), you noticed that all the children gave their leftovers to Kotaro but Kotaro didn't say anything, he just accepted like a good child, the mothers of the little ones noticed this by saying the following Mother: honey, don't give the leftovers to Kotaro.. but the child answered happily Child: Mommy, it doesn't matter, Kotaro likes it! the boy said happily, Kotaro had gained weight because of this.

Kotaro lives alone.

@Sanji