Koisuru Boukun

Graduate student Souichi Tatsumi is demanding, violent, tyrannical… and homophobic. Which is unfortunate for his underclassman/lab assistant, Tetsuhiro Morinaga, who is hopelessly in love with him despite the threat to his own personal safety.

Set a year after Morinaga confessed his feelings to Souichi in Challengers, and was miraculously allowed to stay friends with him after getting a kiss. Now Morinaga has been given an aphrodisiac by his friend Hiroto to move things along. Morinaga vows to never use it…. only for Souichi to drink it on his own while looking for alcohol in Morinaga's room.