Plot Summary: Wataru is a young man who moves into an apartment next to Tomoka and Fumie Fusono, two voluptuous sisters who used to know him when he was a shy child. Now Wataru is all grown up, and the Fusono sisters are ready to take full advantage of that fact.
The Big Chest Grandprix is just around the corner and the girls are pumped! Through this competition the girls have decided that whoever wins will win both the cash prize and Wataru's heart. Which of these three girls will be the ultimate winner?