The Rouran Academy sports festival is coming up, and Sakamachi Kinjiro has a lot riding on one very special event...but there's one small problem. How do you prepare for a competition when your challenger won't tell you what it is? Narumi Schrödinger, one of the school's top athletes, has plans to make Jiro pay for going on a date with her little sister. The event she has in store for him will cost him dearly!
Of course, that's the least of Jiro's troubles. After suddenly losing their home in a fire, he and his sister, Kureha, have to look for a new place to live. Suzutsuki Kanade offers a helping hand...but the price may be more than Jiro can handle.