It will premier in April 8
The official website for the anime adaptation of Layton Mystery Tanteisha: Katori no Nazotokoi File has uploaded a new promo whcih you can see bellow:
Anime News Network describes the story as follows:
“The anime will be based on Level 5's Layton’s Mystery Journey: Katrielle and the Millionaires’ Conspiracy game that focuses on Katrielle “Kat” Layton, daughter of Professor Hershel Layton.
Like the game, the anime will be set in London and follow Katrielle as she solves mysteries with her talking dog Sherl.”
Via: Anime News Network