The Snow Specter: The Horror of Bloodstained Lake!!

The Snow Specter: The Horror of Bloodstained Lake!!

Available on Prime Video, Crunchyroll
S1 E17: Miyuki was supposed to welcome her friends to the inn, but she is nowhere to be found. Yuki, claiming to be Miyuki's younger sister, greets them instead. Yuki suspects Miyuki died and is now a spirit.