Stormy Destiny: Third Stage

One day, Fujiki transfers in to Hayase’s class, and suddenly steals a kiss from him. “What are you doing?! We’re both guys!” And so an adventure of love begins, featuring a male princess(?) and taking place in the past, present, future and even another dimension… (Source: Jmanga)

Picking up right where the previous series left off, Kazuhiro has finally reconciled his past life with the present and accepted Fujiki's feelings, but their enemies still haven't given up on getting their hands on Kazuhiro, and with their leader finally awake they're more of a threat than ever.