花户小鸠（花泽香菜 配音）是一个身份神秘的天然呆少女，她的工作就是治愈“受伤的心”，然后收集治愈后的心灵所留下的透明碎片。她是怎样拥有这样的能力，其目的又究竟为何，这一切都是谜题。在一次偶然之中，小鸠来到了一间快要废校的幼稚园，善良的园长冲浦清花（折笠富美子 配音）和园中可爱的孩子们感动了小鸠，她决定不再流浪，留在此处帮忙。
在幼稚园中，小鸠认识了孤儿藤本清和（前野智昭 配音），虽然清和经常对小鸠粗声粗语，但他的关怀之情溢于言表。此外，一些心灵曾经受过伤害的人们也渐渐的聚集在了小鸠的周围，在帮助他们的同时，小鸠的内心也逐渐得变得更加坚强。
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