Toilet-bound Hanako-kun manga volume 21 features story and art by AidaIro.

It's autumn at Kamome Academy, and the annual school festival is underway. While Nene and her friends are busy with preparations, a select few begin carrying out their plot in the shadows—they have their eyes set on the yorishiro of No. 1 of the seven School Mysteries, the Clock Keeper. When supernaturals burst onto the scene, what was supposed to be a fun school festival turns into an unexpected crisis…!