The Prince's Black Poison Vol. 2 (Kodansha, 2018)

Rizu is interested in the shabby chemistry teacher Azuma-sensei, so things get awkward between her and her childhood friend Souta-kun... Souta-kun tries to eliminate the competition like always, but this teacher is a surprisingly challenging opponent?! The gorgeous Souta-kun plots and schemes. Crack open this cunning, adorable childhood friend love story!