某天,一直以为自己是独子的高中生·阳太郎,其亲生母亲突然前来相认,之后更接他到真正的家里居住。可是当阳太郎踏进家门的一刻,他才意识到原来他还有19位姐妹。就这样,这位新哥哥便要和19位姐妹好好地相处了……A high school senior named Yotaro thought he was an only child-until he met his real mother and discovered that she has 19 daughters, from 0 to 18 years old. He ends up living with his "true family."
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