Tying the Knot with an Amagami Sister 15

Asahi and her squad of fans are getting hyped up for the approaching All-Japan Relay! But when a letter addressed to Asahi and claiming to be from her birth father arrives, it causes a big fight between Uryu and Yae! And son, the whole history of her past before coming to the Amagami Shrine comes to light! Can Uryu come to accept that Asahi wants to shake off the bonds of her past and face forward to the future, wherever it may take her?