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One summer vacation...

With his parents posted overseas for work, the protagonist is living alone in his childhood home. One day, the ones who show up at his door aren’t two cute girls but twin otokonokos (feminine boys).

They have come to fulfill a promise they made with him when they were little—that when they grew up, he would make them his brides.

Smiling confidently, the two explain that they’ve worked hard all this time to ensure that he will definitely marry them. According to them, both sets of parents have already approved of the arrangement.

However, they will only be living together until the end of summer vacation.

Thus begins their life together as a trio. Throughout their days, the twin otokonoko use every trick in the book to try and win over the protagonist.

By the end of summer, what will become of the relationship between the protagonist and the twins…?