Layton Mystery Tanteisha: Katri no Nazotoki File

Layton Mystery Tanteisha: Katri no Nazotoki File was produced by the animation studio LIDENFILMS and debuted in 2018 as a television series extension of the popular Professor Layton puzzle-adventure game franchise. Developed as a lighter, more episodic companion to the main series, the show was created to appeal to a younger audience while maintaining the brand's signature mystery-solving aesthetic. The shift in focus toward Katrielle Layton as the protagonist signaled a move to diversify the series' narrative scope beyond her father's established adventures.

The production team leaned into a vibrant, accessible art style that mirrored the whimsical character designs found in the Layton Mystery Journey game. By centering the story on detective agency files in London, the designers aimed to keep the classic 'puzzle-heavy' tone while ensuring the animation remained fluid enough for weekly broadcasts. While the series received moderate praise for its charm and accessibility, it is primarily recognized by fans as a faithful, lighthearted expansion of the franchise's universe.