东京·筑地。小学生薰和武志的班级里，转来了一个新同学宏树，从此三人成为好友。在筑地市场里奔跑玩耍，在薰的父母经营的饭店里一起吃饭，三个人彼此关照，结成友情牢靠的“圣洁三角形”。 随着时间的推移，三人渐渐长大成人，在筑地鱼市场工作的武志、进入报社的宏树和在银座文具店的薰，他们各自走上工作岗位。本以为可以继续下去的友情却由于武志突然向薰的恋情告白而出现转变。在薰与武志的订婚典礼上，急忙向家赶的武志为躲避来车而出了交通事故，性命尚保，然而一直昏迷在医院的病床上…… 三年来，为了武志，宏树从报社的社会部调到可以按时下班的整理部，和薰一直到医院照顾武志，并相信“圣洁三角形”友情的持续。一天，武志的叔叔耕助突然拜托宏树，请他代武志带给薰一生幸福……武志奇迹般地从昏迷中苏醒过来，曾失去记忆的他了解了真相，然而留给三个人的时间，只剩下了30天……Kaoru, Hiroki and Takeshi are childhood friends. Adults now, they have gone their separate ways, but still live close to each other in central Tokyo. Hiroki works for a newspaper company, and Takeshi has followed in his father's footsteps to work at the Tsukiji fish market. Both men love Kaoru, but Hiroki is too shy to express it. Finally, Takeshi proposes to her, and she accepts. On the day of their engagement party, Takeshi crashes his car and becomes comatose. After three years, Takeshi comes out of his coma - but with no memory of his engagement.
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