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The summer vacation is about to end. Mitsuteru Hidaka looks at the calendar with a mysterious expression. It's not because I want a long vacation; it's that the time for us to make serious decisions is approaching. Kouki and his four sisters spent the summer vacation at the neighboring Hanabishi family's house. Since the houses are adjacent and their fathers are best friends, the four sisters of the Hanabishi family have loved Kouki like a little brother since childhood. The four sisters of the Hanabishi family are beautiful, but they have strong personalities and many issues.
