Tobimaro Mizunokouji is the heir to the Mizunokouji sporting goods empire. Shuutarou Mendou's baseball playing, starry-eyed, childhood rival.

For generations the two wealthiest families in Japan, the Mizunokouji clan descended from Japanese nobles and the Mendou clan descended from the samurai, have been feuding. As their families fought so did Shuutarou and Tobimaro. A battle for superiority that has continued from childhood to the present day. They even still address each other as "Shuu-chan" and "Ton-chan" as they did when they were children.

Their rivalry has brought forth many duels between the two proud heirs. Their most sacred duel happens to be in the form of an annual baseball match with their honour on the line. But every game they've played so far has ended in a tie (actually a double knock out). To prepare for the game Tobimaro lives in the mountains, rigorously training for the their annual duel even though the training involved more martial arts than actual baseball. In the mountains Tobimaro had nothing to eat so he had to live on baseballs to survive. Because of this tendency to inhale balls he often swallows the baseball in the middle of a game.

Ton-chan has a certain mistrust and dislike of women which stems from his childhood with his rival's sadistic sister Ryouko. Stangely even though he doesn't like women, his personal secret police and servants are women.

Tobimaro is what you'd call an eccentric, if not only old fashioned. He rarely bathes, wears a torn and ragged samurai robe and often prefers to live life as it once was in ancient Japan. His looks and habits conceal the actual wealth that he possess.