Shotaro Nagasawa knows about living on the edge.

Fistfights, bloodshed and near-death encounters seemed to dog the teen wherever he went. He lost track of the number of times he was ambushed by thugs on his way home — they'd run him down, knife him in the leg, and beat him with metal bats and bricks.

The Osaka native never felt safe, even inside his home, and kept baseball bats in every room of his apartment so he could strike intruders at any time.