Fukushuu wa Gouhou-teki ni

After being cruelly betrayed by her boyfriend, Mayu, an office lady, meets the beautiful "legal revenger" Ellis and is invited to the legal detective agency she runs. There, Mayu sees the true identity of Ellis, whom she thought was a beautiful woman, and a young girl who calls herself her secretary. Suspicious of Ellis, Mayu tries to leave the place, but Ellis proposes to Mayu the "secret menu" of the legal detective agency.

(Source: Natalie, translated)