@popo53414
No he is alive, and still together with Hiro.
His name is Izumi miyamura.
She calls him I-kun./Ik-kun.
Like how his mother calls him.
Final page of part 2 mentioned that he will be late for dinner.
Curious though. Seems like south is living with them in the old house. The parents were almost never home, because of work. They sleep some were else often.
Could be that they moved out, while miyamura moved in.