Heart Break Detective Momose

is a Japanese light novel series written by Saginomiya Misaki, with illustrations by Nardack. The series began publication on April 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The series won the Dengeki Bunko Magazine Prize in the 19th Dengeki Novel Prize.

Synopsis
"Love will end someday ──"

Being caught up in a junior Chiyoda Momose who said such a thing, Nonomura Kuju was spending days helping her as a "broken heart detective". ── Broken heart detective. It is a school-unofficial detective activity that takes place in the club room of the Mystery Study Group.

Clients who have troubles with broken hearts visit them to find out the truth about broken hearts for those who have lost love.