There is a scribble on the back of Bunji's backpack.  It's actually a picture of Aso, Bunji's imaginary friend; Bunji is invited to Chi's house for dinner.  He's amazed by the collection of figures and such lining Chi's room, but the atmosphere turns bad when he's told "Don't Touch!"; Mom's brother from Kochi has come to visit Tokyo.  Mom is busy, so Dad takes him out drinking.  However, without Mom, the two don't know what to talk about...;When Mom was a child, she hated the red dragonflies that would fly at the end of summer and the beginning of the new semester.
she wouldn't forgive them!