Kandou Sareta Node Tantei-Ya Hajimemasu! Jitsu Wa Boukoku No Joou Da Nante Naisho Desu

Summary

When it comes to light that Octavia de Reine isnt a legitimate member of the noble House of Reine, she swiftly finds herself disowned. At first she takes this in stride...until her power hungry father and ex-suitor start vying for the house full of mysterious heirlooms that her doting grandmother left her. Little does her family know that shes destined to inherit an even greater legacy. Olivia hopes to follow in Grannys footsteps and become a famous detective, after all! Shell face off against young noblemen, phantom thieves, and magical items corrupted by demonic forces. Oh, and one vengeful angel queen. Moreover, whos this suspiciously young marquis that seems so smitten with her...?