He made his Giants debut in 2007 against the Tokyo Yakult Swallows, pitching 2/3 of an inning and giving up a hit and a walk in that span.

He saw expanded action in 2008 as a mid-season call-up, and he was part of a young bullpen that led the Giants to a Japan Series berth against the eventual champion Saitama Seibu Lions.

Ultimately, Tono was a part of the 2009 Japan Series Champion Giants, who defeated the Hokkaido Nippon-Ham Fighters in six games to with their 21st title.

He also started the deciding 6th game in the series, but had to leave with two down in the very first inning after being struck on the hand on a line drive by Nippon Ham Fighters first baseman Shinji Takahashi.

However, Tono does compensate with good control on his fastball and also has an array of other pitches, among them a sharp curveball, a late-breaking slider, and a forkball, leading to a lot of strikeouts.