Netsujou

From DMP: Hikaru, a second year high school student, is obsessed with Shima, a male teacher. Surprisingly, Shima is not averse to the boy's affections. He even convinces Hikaru to study hard so that when he graduates, they would openly become lovers. However, Amamiya, an ex-lover of Shima, steps into the picture and tries to win him back. Will Hikaru and Shima's passion prove great enough to hurdle all the obstacles stacked against them?