Kosaku Hatanaka (Kazuya Kamenashi) is a talented boxer who turned pro at the age of 19, winning his debut match with a first round KO. He is talented, but he has no guts. His uncontrollable appetite is an even bigger problem. He can’t put himself in the right weight class, he runs out of energy because of hunger, and he gets knocked out while his eyes are set on food at the ringside.

Kosaku’s life has changed ever since he met Sister Angela (Meisa Kuroki), a novice nun in the convent near his boxing gym. Sister Angela became the source of his power, and Kosaku fights only to win the heart of Sister Angela.

In each episode, Kosaku has to beat his unique opponents: a retiring boxer, a middle-aged boxer, a chicken hearted boxer who can’t punch, etc. In addition, he has to overcome his strong appetite, hard training, seduction to skip training, and interference from his rivals. Can this boxer with no guts become a Japanese boxing champion and win Sister Angela’s heart?

「一磅的福音」中的男主人翁畑中耕作（亀梨和也饰）是一个自小就被称为天才的拳击运动员，但当他踏上职业拳击手的道路时，成绩却一落千丈。这倒不是他不努力，而是他实在过于贪吃，结果体重一长再长，多余的脂肪既影响了灵活敏捷的身手，也令他无法通过本级别的体重测试。为了拳击，在教练等一干人的威逼下，他只好赌神发誓地开始节食减肥。同时他也经常愧疚地去附近的修道院向修女玛丽亚忏悔。性情温良的玛丽亚每次都耐心地对他偷吃的罪过进行开导，努力引导这只迷途的羔羊。在这场减少一磅的战争中，玛丽亚逐渐和耕作产生了感情……不知道故事的最后两人会否走在一起呢？