Bad Teacher's Equation Volume 5 (Yaoi Manga)

Graduation is looming for Atsushi, and Masami is having second thoughts about the deal he's made and the kiss that's the reward. Is he reluctant to kiss him because he truly wants to reject Atsushi, or is he afraid to concede other feelings towards Atsushi, given that after graduation there will be no barrier between them entering a romantic relationship? It's going to be all or nothing in the final not-to-be-missed volume of Kodaka Kazuma's classic Boy's Love story!