Akane-Iro ni Somaru Saka Temporada 1 Episódio 3

Junichis teacher Seijirou Sugishita goes missing in an abandoned portion of the school. The student council president Mitsuki Siina enlists Junichi and his friends to search for him in the abandoned school building. While searching Junichi and Yuuhi fall down a trap door into a pit. The two are forced to work together to try and get out, but are unable to escape. In the same pit Mr. Sugishita wakes up from under a blanket and the trio are found shortly afterward by Minato.