Through some twist of fate, Maviel is left with no choice but to work as a part-timer at the Moriartea Cafe. But here's the twist! She needs to undergo detective training while working as a waitress.
Under the tutelage of Sigmund, the romantic Psychology student who has mastered the science of deduction, Maviel will learn the ways of a deductionist. She also has to work with Landice, the counter detective who doesn't need to leave the cafe to solve a case, and Nikolai, the ninja-like detective who's a;so a master of stalking.
Join them as they solve cases presented by clients to their cafe-slash-detective agency.