人数合わせで合コンに参加した俺は、なぜか余り物になってた元人気アイドルで国宝級の美少女をお持ち帰りしました。

Makishima Yuutarou is told by Asaki Seiichi, a flashy guy on the soccer team at the same university, "I put you in the mixer without asking because the number of guys wasn't enough." Furthermore, it seems that the other participants already have their own girls, so Yuutarou is told to take home the one remaining girl. However, that remaining female college student turns out to be Kiraboshi Ayane, the former center of a hugely popular idol group!? Yuutarou's life changes dramatically when he meets Kiraboshi Ayane, a former idol who is as cute as a national treasure.