かつての名門草野球チーム「ピーナッツ」において伝説の三塁手と呼ばれた主人公・秋吉光一は、ふとした事から今や弱小チームと化してしまったピーナッツの建て直しに取り掛かる。キャプテン・相良たちの住む街の再開発の是非を懸けて、ピーナッツは強豪チームと戦うことになるが･･･。 平均年齢35歳のおじさんになった元野球小僧たちが、人生に悩みつつも前を向いて生きていく勇気を取り戻していく姿をコミカルに描いた青春群像劇。

Senichi was born in 1964, when the entire nation was excited about the Tokyo Olympics. As an elementary student, Senichi won a footrace and got a taste of what winning felt like. Since then, Senichi takes part in various competitions including drawing and usually wins. He keeps struggling to win gold medals at competitions.

The movie follows the life of an unpopular comedy duo. The duo, called "Boso Swimmers", have been working together for 12 years, but the duo sees little future in their comedy careers. They then begin to write their thoughts in a diary