Games like The Fifteenth: A Pluvial Prelude
Games like The Fifteenth: A Pluvial Prelude include Sweet Home, Phoenix Wright: Ace Attorney Trilogy, Cyber Manhunt, Unheard - Voices of Crime, and Sanfu. We matched them by the tags players give The Fifteenth: A Pluvial Prelude on Steam (Visual Novel, Word Game, RPG, Detective, and Crime): closest matches first, and among equally close ones the better-known games.

Sweet Home
Shared: Visual Novel · RPG · Word Game

Phoenix Wright: Ace Attorney Trilogy
Shared: Visual Novel · Detective · Mystery

Cyber Manhunt
Shared: RPG · Detective · Mystery

Unheard - Voices of Crime
Shared: Detective · Crime · Mystery

Sanfu
Shared: RPG · Mystery · Visual Novel

The Deed
Shared: Visual Novel · RPG · Crime

Aliya: Timelink
Shared: Visual Novel · RPG · Word Game

Threefold Recital
Shared: Visual Novel · Detective · Mystery

Ignited in Cavern
Shared: Visual Novel · RPG · Word Game

Danganronpa: Trigger Happy Havoc
Shared: Visual Novel · Detective · Mystery

Disco Elysium - The Final Cut
Shared: RPG · Detective · Visual Novel

Magical Girl Witch Trials
Shared: Visual Novel · Detective · Mystery

Raging Loop
Shared: Visual Novel · Mystery · Detective

Danganronpa 2: Goodbye Despair
Shared: Visual Novel · Detective · Mystery

子归 - Blossom
Shared: Visual Novel · RPG · Detective

Firework
Shared: Indie · Visual Novel · Mystery

Far Away
Shared: Visual Novel · Word Game · Singleplayer

Stiff Neck
Shared: Visual Novel · RPG · Word Game

Danganronpa V3: Killing Harmony
Shared: Visual Novel · Detective · Mystery

Back to the Dawn
Shared: RPG · Detective · Crime

Persona 4 Golden
Shared: RPG · Mystery · Singleplayer

WILL: A Wonderful World / WILL:美好世界
Shared: RPG · Word Game · Indie

The Chrono Jotter
Shared: Visual Novel · Detective · Indie

Billionaire Lovers
Shared: Visual Novel · RPG · Emotional