Aichi`s little sister, Emi, finds it strange that Aichi seems to be having more fun lately, as he usually lives out his life being bored... One day, on her way home from school, Emi sees some bad-looking guys taking Achi away somewhere. Worried, Emi follows them, and arrives at a store named "Card Capital".

One day, when Aichi pops his head into Card Capital, Morikawa is fighting a kid he`s never seen before. The kid is so powerful, Morikawa can`t even scratch him. His name is Kamui Katsuragi, and he`s a famous grade-school fighter in the area.