Tying the Knot with an Amagami Sister 5

When Uryu sees a different name on Yae's driver's license, the same name as a girl from his past, he decides to get to the bottom of it while on a late-night drive to Inari Shrine with the sisters and Makoto, Yae's best friend. However, Makoto chews him out for snooping around. Then, in the middle of their midnight hike, Yae suddenly takes a tumble down Mt. Inari and goes missing!! Will Uryu be able to find her?! And, what is the truth behind the name "Reiko Ichijoji"?!