Houkago Shounen Hanako-kun

Houkago Shounen Hanako-kun (放課後少年花子くん/Afterschool Boy Hanako-kun) is a spinoff manga series written and illustrated by AidaIro.

The spinoff manga is published on pixiv comic and is available to view for free. It is updated once a month.

Plot Summary
The spinoff depicts short stories about the daily lives of the characters outside of the main storyline.