Kono Minikuku mo Utsukushii Sekai EP3 - The Two Silhouettes

Ryou is waiting to meet someone, although he himself doesn't really know this until he meets her. Her name is Akari, and she is obviously similar to Hikari in that she doesn't remember her past or have a name. Akari is living in the forest, because she remembers being there when she saw a night where there was a very bright light, and she wants to see a night like that again. Ryou begins going to see her regularly on his walks home, and begins to feel very protective towards her.