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20世纪80年代，自幼生在团地（住宅区）的12岁少年渡会悟（滨田岳 饰）在小学毕业后做出一个重大决定，他将毕生留在各种基础设施齐全的团地，绝不迈向外面的世界。对此，阿悟的母亲（大冢宁宁 饰）似乎深表认同，她不干涉儿子的决定，只在一旁守望者这名思维奇怪的少年靠着自己的力量一步步成长、坚强起来。此去经年，阿悟严格执行着作息表，他视极真空手道宗师大山倍达为偶像，发誓保护所有团地的好伙伴。时光流逝，当初阿悟所在的小学同级107人一个个离开团地。在此期间，他与青梅竹马松岛有里（波瑠 饰）、好友薗田宪明（永山绚斗 饰）、女友绪方早纪（仓科加奈 饰）各自经历着人生波折。团地一天天衰败冷清，转眼发现，阿悟早已孑然一身…… 　　本片根据久保寺健彦的原著改编。After Satoru Watarai graduated from elementary school, he dropped out of school and decided to live within his apartment complex, never to venture outside. Satoru Watari then meets his old friends as they are coming back from their middle school classes. Satoru has now gotten a job at a cake shop within the apartment complex and eventually gets engaged to one of his friends. Satoru, still lives within the apartment complex only, but, as time passes, more of his friends leave.