As Mad As March Hare

Haruki warns a shoplifter and is about to be framed as the culprit, but is saved by Keigo, a customer who is present. After that, Haruki began to meet him often, and Haruki grew fond of Keigo, who was friendly and had a big brother-like personality. One day, Haruki encounters Keigo being assaulted by his roommate Maya. Haruki, who is shaken by the strange atmosphere between the two, but wants to help Keigo, tries to stab Maya in the neck. However, Keigo is far from Haruki's ideal...!?

(Source: Kaiousha, translated)

Note: Includes one extra chapter.