Story
Junta has a problem: he's deathly allergic to girls! All this changes with the arrival of Karin, a gorgeous time-traveler who transforms him into the Mega-Playboy, the sauciest girl-magnet around. Suddenly, Junta's wildest dreams have come true, and all the prettiest girls in school have fallen in love with him. With so many adoring fans, mayhem is sure to follow, and Junta finds himself in the center of one hilarious romantic mishap after another.
Synopsis via AniList (English).