The story takes place in the world of "Earth Dash", an alternate version of Earth where human society is far more advanced on the moon than on the planet's surface. A popular sport is BFB (Big Foot Basketbal...

Koichi lives an ordinary junior high schooler's life, until one day when the computer of the Tower of Babel authorizes him as a master of the tower. Koichi is actually a distant descendant of the space alien...