Beast of the After School

One night, Sunagawa is attacked by a large beast and loses consciousness. The beast was actually Kuroda, a transfer student, who claims to be a werewolf, and ends up as his roommate. Kuroda appears bad-tempered and irreverent, but when Sunagawa learns that their teacher Jono is threatening Kuroda, he wants to protect Kuroda. He starts to secretly watch Jono like an obsessive boyfriend. Such a strange attitude only makes Kuroda more conscious of Sunagawa.......

A werewolf and an honor student find a reason for their obsessive love for each other

(Source: Kadokawa, translated)

Note: Includes one extra chapter.