Soia Asiro is a average high school student. He belongs to a secret clan were age doesn't matter but number of generation do. After getting rejected by his crush he was sad until one of his crush's friend confessed her love with him. In school he surprisingly found out there is two girls from same clan as him and also the same generation too. Now he got two new little sisters and his new girlfriend doesn't know about this. And create so many misunderstanding.