十二岁的神山满月（绪方惠美 配音）和外婆相依为命，酷爱唱歌的她却由于喉部的癌症而被外婆严令禁止歌唱。满月和幼年玩伴英知（木村良平 配音）有着约定，为了完成约定，满月向着成为歌手的道路上努力前进。某一日，一个名为“香葱拉面”的组合出现在了满月的满前，他们自称见习死神拓人（斋藤恭央 配音）和由依（本多知惠子 配音），他们告诉满月，她只剩下一年的寿命，而只要拿到她的灵魂，拓人即可成为正式的死神。伤心的满月感动了由依，他们决定帮助满月在死前达成她最后的心愿。由依将满月的外表变成了十六岁的少女，这样她才够资格参加歌唱大赛。没想到，满月以“FULLMOON”的艺名一举获得成功，而在此过程中，拓人对满月的感情也渐渐变得复杂起来。英知的归来让拓人颇受打击，而拓人遗失已久的记忆也将成为威胁到拓人生死存亡的关键。
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