Happiness! S01 E01 Valentine

Haruhi Kamisaka is one of the mages in training at Mizuhosaka Academy who on Valentine's Day, runs into Yūma Kohinata, who she believes may be a boy she's been trying to find for years. After the magic section of the academy suffers from a gas explosion, Haruhi and her friends transfer over to the normal section and Haruhi ends up in Yūma's class.