Tying the Knot with an Amagami Sister 19

Amagami Shrine is busy preparing for the New Year's festivities. But Yuna suddenly swaps places with herself from ten years ago! As young adult Yuna interacts with her now-deceased mother, she begins to remember certain truths about her childhood. But why did she forget in the first place? And how did she end up at the Amagami Shrine? As she uncovers her past, she gains the confidence necessary to fly into the future! Meanwhile, in the present, Yae, Asahi, and Uryu scramble to get everything ready! Can they really weather this crisis without Yuna?!