位于北海道的某个小城市，在市政府工作的奥津（玉山铁二 饰）正和同事前往密林深处，不久前此处发现一辆废弃的汽车，车内则有一具中年男子和一条狗的骸骨。汽车内外除了几张沿途消费小票外，没有任何能够证明该男子身份的证件。经对骸骨的检验得知，男人死后长达半年时间狗狗才随之死去。童 年有着养狗经历的奥津对男人的经历倍感好奇，他自费前往死者旅程的起点——东京调查，并在路上搭载了偷偷跑到东京选秀的同乡少女有希（川岛海荷 饰）。二人以购物小票为线索，一路追寻着中年男子“前田”（西田敏行 饰）及其爱犬Happy的足迹。经过探访，他们渐渐拼凑出“前田”先生那平凡寂寥的人生……本片根据村上たかし的同名漫画改编。

早在半年前就斷氣的中年男子陳屍於小客車當中，身旁還有一隻在一個月前死亡的秋田犬，這之間到底隱藏怎樣感人的故事呢？

An abandoned car is discovered near a camping ground and inside it is the body of an identified middle-aged man and a dog who seems to have died months later. This is the story of the life of the loving and faithful dog and his owner told from the dog's point of view. City hall employee Kyousuke Okutsu is assigned to uncover the man's identity for a proper funeral. As he investigates the situation, he remembers his late family and his own dog's unfailing loyalty.

夏の北海道。山中に放置されたワゴン車から中年男性と犬の白骨死体が発見された。遺体の埋葬処理を請け負った地元市役所の福祉課に勤める青年は、何かに導かれるように、残された手掛かりから死んだ男性の足取りを辿る旅に出る。途中、ひとりの少女と出会い、彼女を旅の道連れにしながら、死んだ男性と、その愛犬との短くも永い旅路を紐解いていく涙溢れる感動のストーリー。

신분이 확인되지 않은 한 남자의 죽음과 개의 이야기에 호기심을 느낀 홋카이도의 한 사회복지사가 남자의 신분을 알아낸다. 도쿄에 도착한 쿄수케는 십대 유키의 지원을 얻어 남자와 개 사이의 충성심과 운명에 얽힌 이야기를 풀어낸다. (2011년 제16회 부산국제영화제)