因为父亲的再婚，十六岁的女高中生朝日奈绘麻（佐藤利奈 配音）入住朝日奈家，她一下子多了十三个新兄弟！父亲和新的母亲住在别处，而绘麻和十三个兄弟生活在同一屋檐下。新生活第一天，迎接绘麻到来的是温柔的长男雅臣和年幼的末子弥。随后绘麻一一见过她的新兄弟，包括同卵双胞胎椿（铃村健一 配音）和梓（鸟海浩辅 配音），而且她还发现同班同学朝日奈侑介（细谷佳正 配音）也成为了自己的兄弟。侑介对于绘麻的到来感到十分吃惊，他似乎对绘麻怀着不一般的情愫。十三个兄弟职业不同，性格各异，绘麻的到来，是否会对他们造成困扰？迎来二十岁生日的昂（小野大辅 配音），酒后竟然说出了心里话……期待有朝一日可以被接纳的绘麻，会与十三个兄弟产生什么样的羁绊？
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