Nazorae Yahitoku Bunsho: Momo to Oni no Wadachi

is a Japanese light novel series written by Akara Arisato, with illustrations by Atusko Nakajima. The series began publication on April 10, 2011 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
My best friend, Maya, jumped and committed suicide. Masami couldn't accept the fact and stumbled upon Ryosuke, a classmate who happened to be there. When he heard about the situation, he pointed out that Maya's death was too unnatural and told Masami to find out the truth of the death together.

Ryosuke, who belongs to a group called "Mystery Shop," is said to have that power to explore the mystery of death. "Mystery" is a magical thing that has been going on since ancient times. Masami decides to entrust it to Ryosuke and then to "Mystery Shop" ... Expected new work appeared.