Sono Suki no Yukue

Izumo is a part-time high school social studies teacher, and he has feelings for Muroto - a popular, handsome physics teacher. As the graduation ceremony for seniors draws close, Muroto takes refuge from his enthusiastic female students in Izumo's classroom. To Izumo, he says, "Please be my girlfriend!!" Also, it seems that Tomogashima, a student who's close to Izumo, likes Muroto as well... The love triangle that revolves around a lighthouse's legend begins during spring break... (Source: MangaPlaza)