From MangaHelpers:
Living on a small island far off the mainland of Japan, Izumo Seto grew up in a small community where the total number of kids from elementary to high school is under a hundred. Not only that, with such close quarters and a tight knit community, word travels fast and everyone knows everything about everyone else, except for one thing: that Seto is going out with the hot new teacher, Ms. Kamome. She came to the island 3 months ago as a new teacher and they fell for each other. But to keep their forbidden love a secret and to throw off everyone else, she is intentionally cruel to Seto in public. But when no one is looking, she melts all over him.