Kikoku no Mori

A quiet town where future and past mix together. One day, a theft case happens there which would be soon forgotten if there were not strange incidents happening around it. The female teacher in the midst of the theft incident disappears, classmates start to behave strangely and mysterious woman shows up before Koichi. Gradually, but surely anomalies begin to penetrate the daily life of Koichi.

[From vndbreview]