Yokomizo Mitsuru becomes stranded on a snow-covered mountain during a blizzard. While searching for help, he collapses, only to awaken in a mysterious forest. At its center stands a solitary mansion, where he encounters two vampires: Chris and Kanon.

Just when he thinks he’s been rescued, Chris drinks his blood, and his body transforms into that of a girl. Now renamed Maron, she is made to work as a maid in Chris’s mansion. As she grows accustomed to her new body and surroundings, her sense of identity gradually begins to change.

[From NookGaming.com]