The Grim Reaper Princess and the Monster of the Otherworldly Library

This is a 2D adventure game themed around "picture books," depicting a story of saving girls who have transformed into monstrous forms called "Shinigami Princesses" due to trauma.

Mono learns that her beloved older sister has been confined to the "Otherworldly Library" as a patient of the contagious disease "Shinigami Disease."

To save her sister, Mono makes a contract with Meeru, a monster living in the Otherworldly Library, and ventures into the world of a picture book...