Haru is a handsome (female) clerk working at a grocery store. One day, she tries to save a man who was about to be hit by a car. Before she knew it, she was in the world of an otome game! She was reincarnated as "Haru Kosmeia".

The world of "Treasure Prince," an otome game that she had played in her previous life. Her position is maid to the villainess Azalea! If the scenario is correct, a bad end will befall Azalea. To avoid the worst possible ending, Haru is dressed as a man and goes to the school...?