When it comes to traits associated with runner-up heroines, Himegasaki Sakurako has them all--but at long last, she enters a relationship with her childhood friend, Natsuki! She's reached her happy ending...or so she thinks, until she realizes an earth-shattering truth: Life doesn't exactly end here. From now on, it's an uphill battle to carefully maintain her relationship with Natsuki and make sure he doesn't forget who the real heroine is around here!