Shinomiya Ginka

"Welcome back, Ryuusei."

A mysterious girl who Ryuusei meets when he comes back to the island. She looks exactly the same as Shinomiya Ginka who was spirited away five years ago—she has not even aged since then. Despite forgotten her own name, she remembers that she loves Ryuusei. Shy and innocent, Ginka wishes to marry him with all her heart.

Edited from the official website