The Layton Detective Agency, a business that helps its clients solve unusual mysteries, is run by Katrielle Layton—daughter of the world-renowned archaeology professor Hershel Layton. Together with her assistant Noah Montoir and talking dog Sherl, Katrielle finds herself unraveling cases involving a newly purchased cursed house, a dress imbued with a demon's curse, and the zombie of a client's deceased spouse, just to name a few. Aside from her more quirky cases, Katrielle has been working on another unsolved problem: the disappearance of her father. Founding the agency was only the first step in her attempt to uncover the truth behind his vanishing. As she continues to take on client after client, each with wackier and stranger issues to tackle, Katrielle steadily closes in on the answer to the biggest mystery of her life.

In 18th century Paris, a coffin is found floating down the Seine River. It carries the corpse of noblewoman Lia de Beaumont: a spy of King Louis XV, and whose younger brother Charles d'Eon has just been knighted. When several disappearances occur throughout Paris, the young knight believes that they are somehow connected to his sister's death. Hoping to find her killers, d'Eon joins the secret police to investigate the incidents. Following the clues, they piece together that a conspiracy between members of the French and Russian nobility, spurred on by a cult, may be behind the disappearances. D'Eon concludes that Lia may have uncovered the truth while on a mission and was killed as a result. That night, the secret police are to arrest the Duke of Orléans on suspicion of being the mastermind. One of their own transforms into a demon called a Gargoyle and massacres the group. D'Eon attempts to rescue the sole survivor, only to find that he too has been transformed. During the ensuing battle, d'Eon is possessed by Lia's vengeful soul, who takes command of his body and slays the Gargoyle herself. In the aftermath, d'Eon must gather allies to discover the depth of this supernatural conspiracy.

A mysterious man by the name of Lee dwells with Aak, Hung, and Waai Fu in the dark alleyways of Lungmen City. Styling themselves as Lee's Detective Agency, they strove to run errands, investigate mysteries, and mediate disputes for their neighbors. Herein lists a few of their actual yet strange cases to go with your tea. (Source: Crunchyroll)

The protagonist of the story, Konoha Inoue, is a seemingly normal senior high 2nd year student. His high school life, other than a hinted incident 2 years ago, can be summed up as normal- if one can dismiss the secret fact that he used to be a female bestselling romance author. Due to that incident, however, he has now vowed never to write again. This continued on until he was forced to join the literary club by the literary club president, the 3rd year female student Amano Tooko, a beautiful girl who has a taste for eating literary works. Now he has been tasked with writing her snack every day after school. (Source: To Say Nothing of the Dog)