Dokudami no Hana Saku Koro

Shigaraki is prone to tantrums, and his unpredictable behavior causes him to be an outsider in his class. One day, model student Shimizu peeks at Shigaraki's clay art piece during arts and crafts and is immediately captivated by it. This event leads to him becoming obsessed with Shigaraki's creations.

(Source: K Manga)