Sumi Takaoka is a generically cute girl with a problem, she has a crush on guy - Mitsuru Sudou - who rumour says prefers buxom and mature and sexy types... everything she isn't. However, she thinks may just be in luck as her Mad Scientist father has just invented a medicine that he has promised will give her the mature and sexy attributes she desires. So, heart pounding as it it always does when she's near Misturu she downs the formula in once gulp...