Hop Step Jump!

Tsuruoka Itto, unmarried at 32 years old, just started a job as the janitor at an all-girls' high school, where he's found the girl he's sure he's going to marry, Asahimura Sayaka. When he hears a scream out behind the school one day, he finds Sayaka-chan fretting about a frog inside her clothes, a problem compounded by her frog allergy which soon causes her to faint. (moviemagnet)