BS Tantei Club ~Yuki ni Kieta Kako~

Ayumi Tachibana returns to her parents home in Ochitani village over vacation to visit her mother, Toshie, who is recovering from illness. She meets with her mother and her old friend Reiko for the first time in years, hoping to ease her fatigue by relaxing at her childhood home. However, Gozo Kusano, the former mayor of Ochitani village, is found dead the next morning in a secluded area outside his house. Toshie was the discoverer of the dead body, and she is apprehended by the police as a suspect because her footprints were the only ones found in the snow near the crime scene. While waiting for her mother to return from the police station, Ayumi learns of a long-lasting feud existing between the Tachibana family and Kusano family. An ochimusha legend passed on in the village, an investigation from 18 years ago, and this new murder all tie into a set of serial killings which Ayumi must solve before it is too late.

[From Wikipedia]