Fics like The Butterfly Effect

Hershel Layton wakes up in a place he hasn't visited in nearly two decades with no idea how he got there. He seems to have memories of a life that nobody around him recognises, and everyone seems confused when he refers to himself as the Professor.

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1. when rain held more than blood / our days are never coming back by attaboyatticus (Layton Kyouju Series | Professor Layton Series, Layton Brothers: Mystery Room)
2. hear it fall from above by theyaremycrocs (Layton Kyouju Series | Professor Layton Series, Layton Kyouju vs Gyakuten Saiban | Professor Layton vs. Phoenix Wright: Ace Attorney, more)
3. Professor Layton vs Phoenix Wright: The Frigid Melody by RainyMeadows (Layton Kyouju Series | Professor Layton Series, 逆転裁判 | Gyakuten Saiban | Ace Attorney, more)
4. To Break a Curse by BugEnthusiast76 (Layton Kyouju Series | Professor Layton Series, 逆転裁判 | Gyakuten Saiban | Ace Attorney, more)
5. In Which Hershel Layton Adopts Several Children, And One Wayward Assistant by pikablob (Layton Kyouju Series | Professor Layton Series)
6. Just the way I am or just the way you see me as? by MagicWhiskers_29 (Layton Kyouju Series | Professor Layton Series)
7. The Cogs of Time by Melinaa (Layton Kyouju Series | Professor Layton Series)
8. The Earth King Has Invited You to Labyrinthia by Charon_the_Sabercat (Layton Kyouju vs Gyakuten Saiban | Professor Layton vs. Phoenix Wright: Ace Attorney, Layton Kyouju Series | Professor Layton Series, more)
9. Not Quite Human (Layton Kyouju Series | Professor Layton Series)
10. Detective Izuku Case Closed by GrimWriter14 (僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), 名探偵コナン | Detective Conan | Case Closed, more)
11. Sometimes Being a Gentleman is Overrated by decaffinatedotaku (Layton Kyouju vs Gyakuten Saiban | Professor Layton vs. Phoenix Wright: Ace Attorney, Layton Kyouju Series | Professor Layton Series)
12. Professor Layton and the Cavalcade of Corpses by Zillasafe (Layton Kyouju Series | Professor Layton Series)
13. The Goldilocks Zone of Imitation by JustKillingThyme (Layton Kyouju Series | Professor Layton Series)
14. Spectral by AnaScrawls (Layton Kyouju Series | Professor Layton Series)
15. Smart little button by MagicWhiskers_29 (Layton Kyouju Series | Professor Layton Series)
16. echoes of the past by theyaremycrocs (Layton Kyouju Series | Professor Layton Series, Layton Kyouju vs Gyakuten Saiban | Professor Layton vs. Phoenix Wright: Ace Attorney, more)
17. The Families of Jean Descole by RainyMeadows (Layton Kyouju Series | Professor Layton Series)
18. Crow's Nest by unavoidablekoishi (Layton Kyouju Series | Professor Layton Series)
19. Danganronpa Investigations by florapetals (Dangan Ronpa Series, 逆転裁判 | Gyakuten Saiban | Ace Attorney, more)
20. Red Silk Tie by Jesterday00 (Layton Kyouju Series | Professor Layton Series)