Once upon a time, there was a data tennis player from Seigaku.

As Sadaharu Inui worked long into the on his new creation, he found the need to call forth an intelligent rival from St. Rudolph. Hajime Mizuki came right away under the promise of a brand new elixer...a juice that would make St. Rudolph and Seigaku stronger. Faster. And the best tennis players in Japan!

Things went along well...when all of a sudden, Proffessor Plu--I mean, Inui added an extra ingredient!

CHEMICAL X.

A large explosion destroyed every bit of Inui's brand new Junior Chemistry Set. Luckily, Inui and Mizuki were unharmed...however, the incident was not without it's side effects.

Strange doubles of every tennis player in the district have been sighted wandering around Japan...why, just the other day, we discovered Kaoru Kaidou drowning kittens in a lake with a huge smile on his face. And then, of course, there was that one guy, Akutsu who was bringing dinners to the homeless shelter...