Season
- Season 1 2018-04-08
Episode
- Episode 1: Katrielle and the Mysterious House
- Episode 2: Katrielle and the Devil's Dress
- Episode 3: Katrielle and the Resurrected Corpses
- Episode 4: Katrielle and the Phantom Thief of the Century
- Episode 5: Katrielle and the Lucky Man
- Episode 6: The Bus that Leapt Through Time
- Episode 7: Ratman Returns
- Episode 8: The 100 Million Pounds that Left with the Wind
- Episode 9: Cat-Colored Skyscrapers
- Episode 10: Professor Layton and the Relics Treasure: Episode 1
- Episode 11: Mystery at New Cinema Paradise
- Episode 12: Aspoirot and London's Holiday
- Episode 13: Katrielle and the Doppelgänger
- Episode 14: Genius Analyst Officer Geraldine Royer
- Episode 15: Katrielle and the Mystery Circles
- Episode 16: Katrielle and the Pandas' March
- Episode 17: Katrielle and the Monster of London
- Episode 18: Molentary Express and Three Incidents
- Episode 19: The Lonely Ghost
- Episode 20: Professor Layton and the Relics Treasure: Episode 2
- Episode 21: Katrielle and the Sweet-Scented Street Labyrinth
- Episode 22: Ultra-High Performance Robot Socketman
- Episode 23: Katrielle and the Great Office Infiltration Strategy
- Episode 24: The Clockwork Sweets
- Episode 25: A Riverside Festival Love Story
- Episode 26: The Diary of Noah
- Episode 27: Fugitive Katri
- Episode 28: The Goddess of the Thames Smiles a Second Time
- Episode 29: Katrielle and the Nessie of Loch Nem
- Episode 30: Katrielle and the Immortal Vampire
- Episode 31: Katrielle and the Witch Wife
- Episode 32: Katrielle and the Prince of the Stars
- Episode 33: Katrielle and the Murder on the Spaceship Bengarian
- Episode 34: Professor Layton and the Relics Treasure: Episode 3
- Episode 35: Professor Layton and the Relics Treasure: Episode 4
- Episode 36: The Cursed London Collection
- Episode 37: Mintan's New Ambition
- Episode 38: Dancing Scotland Yard Great Investigation Line
- Episode 39: Katrielle and the Invisible Baby
- Episode 40: Geraldine Royer and the Final Customer
- Episode 41: Katrielle and the Strange Spirit Photo
- Episode 42: Great Detective Sherl O.C. Kholmes
- Episode 43: Katrielle and Horror Castle VR
- Episode 44: Katrielle and the Superman Chef
- Episode 45: Katrielle and the Ghost Club
- Episode 46: Katrielle and the Hundred Faces of Mona Lisa
- Episode 47: The Millionaire Ariadne's Conspiracy (1)
- Episode 48: The Millionaire Ariadne's Conspiracy (2)
- Episode 49: Professor Layton and the Relics Treasure: Episode 5
- Episode 50: Professor Layton and the Relics Treasure: Final Episode
Layton Mystery Detective Agency: Kat's Mystery‑Solving Files Season 1 Aspoirot and London's Holiday
The story is set in London and follows Katrielle as she solves mysteries with her talking dog Sherl.
