Kanata no Mori

Shinichi works at the newspaper company and travels around Europe together with Mina who he met during college years. But Mina suddenly disappears during the trip. He find a witness claiming she entered the "Lost Forest" where vampire lived. Shinichi follows Mina, but gets a serious injury during a wolf attack. He finds shelter in a mansion he stumbles upon in the forest. He is greeted by the owner, two maids and Mina who lost memory. He stays at the mansion to treat his wound, but at the same time tries to restore Mina memory.

[From vndbreview]