High school student Takaoka Sumi has a huge crush on Sudou Mitsuru but she lacks the confidence to tell him. She asks her father who works at a pharmaceutical company if he has anything that can help and he gives her a drink that is supposed to make her sexier. Too bad for Sumi that her father is a bit of a mad scientist type.

Now how is she supposed to confess when, every time her heart runs away on her, she turns into the male "transfer student" her crush has started to look up to as a role model?