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 manga is published in the PFantapy (Pファンタピー) which is hosted on pixiv comic, and previously updated once a month. The most recent chapter was released in June 2019, and the date for the next update will be announced on the GFantasy twitter.

Fifteen chapters were collected and published in a volume of the same title on August 27, 2019 (the same day as Volume 11's release).

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