Season
Season 1 Episode
- Season 1 Katrielle and the Mysterious House
- Season 1 Katrielle and the Devil's Dress
- Season 1 Katrielle and the Resurrected Corpses
- Season 1 Katrielle and the Phantom Thief of the Century
- Season 1 Katrielle and the Lucky Man
- Season 1 The Bus that Leapt Through Time
- Season 1 Ratman Returns
- Season 1 The 100 Million Pounds that Left with the Wind
- Season 1 Cat-Colored Skyscrapers
- Season 1 Professor Layton and the Relics Treasure: Episode 1
- Season 1 Mystery at New Cinema Paradise
- Season 1 Aspoirot and London's Holiday
- Season 1 Katrielle and the Doppelgänger
- Season 1 Genius Analyst Officer Geraldine Royer
- Season 1 Katrielle and the Mystery Circles
- Season 1 Katrielle and the Pandas' March
- Season 1 Katrielle and the Monster of London
- Season 1 Molentary Express and Three Incidents
- Season 1 The Lonely Ghost
- Season 1 Professor Layton and the Relics Treasure: Episode 2
- Season 1 Katrielle and the Sweet-Scented Street Labyrinth
- Season 1 Ultra-High Performance Robot Socketman
- Season 1 Katrielle and the Great Office Infiltration Strategy
- Season 1 The Clockwork Sweets
- Season 1 A Riverside Festival Love Story
- Season 1 The Diary of Noah
- Season 1 Fugitive Katri
- Season 1 The Goddess of the Thames Smiles a Second Time
- Season 1 Katrielle and the Nessie of Loch Nem
- Season 1 Katrielle and the Immortal Vampire
- Season 1 Katrielle and the Witch Wife
- Season 1 Katrielle and the Prince of the Stars
- Season 1 Katrielle and the Murder on the Spaceship Bengarian
- Season 1 Professor Layton and the Relics Treasure: Episode 3
- Season 1 Professor Layton and the Relics Treasure: Episode 4
- Season 1 The Cursed London Collection
- Season 1 Mintan's New Ambition
- Season 1 Dancing Scotland Yard Great Investigation Line
- Season 1 Katrielle and the Invisible Baby
- Season 1 Geraldine Royer and the Final Customer
- Season 1 Katrielle and the Strange Spirit Photo
- Season 1 Great Detective Sherl O.C. Kholmes
- Season 1 Katrielle and Horror Castle VR
- Season 1 Katrielle and the Superman Chef
- Season 1 Katrielle and the Ghost Club
- Season 1 Katrielle and the Hundred Faces of Mona Lisa
- Season 1 The Millionaire Ariadne's Conspiracy (1)
- Season 1 The Millionaire Ariadne's Conspiracy (2)
- Season 1 Professor Layton and the Relics Treasure: Episode 5
- Season 1 Professor Layton and the Relics Treasure: Final Episode
Layton Mystery Detective Agency: Kat's Mystery‑Solving Files
8.00 24 minutes The story is set in London and follows Katrielle as she solves mysteries with her talking dog Sherl.
