Kochira ga Mushuu Tantei Jimusho

From MangaHelpers:
Gamushuu Agency´s director, Kudo, got into this line of business for one reason: she idolized the private investigator characters she saw in novels and TV shows where they would uncover a dark network of criminals and take them down using analytical and deductive techniques. However, the reality is far from it where with the help of her assistant Suga, they deal mainly with mundane cases like missing people, stalker cases and cheating spouses. But Kudo will not stop until a client comes through that door with a case that will put even the fictional characters to shame.