Games like 呼救Mayday
Games like 呼救Mayday include Persona 4 Golden, Back to the Dawn, Undertale, Persona 5 Royal, and Return of the Obra Dinn. We matched them by the tags players give 呼救Mayday on Steam (Mystery, RPG, Detective, Multiple Endings, and Story Rich): closest matches first, and among equally close ones the better-known games.

Persona 4 Golden
Shared: Story Rich · RPG · JRPG

Back to the Dawn
Shared: RPG · Detective · Story Rich

Undertale
Shared: Story Rich · Multiple Endings · RPG

Persona 5 Royal
Shared: Story Rich · RPG · JRPG

Return of the Obra Dinn
Shared: Mystery · Detective · Story Rich

OMORI
Shared: Story Rich · RPG · Multiple Endings

DELTARUNE
Shared: Story Rich · RPG · Pixel Graphics

Murders on the Yangtze River
Shared: Detective · Mystery · Story Rich

OCTOPATH TRAVELER™
Shared: RPG · JRPG · Story Rich

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

Clair Obscur: Expedition 33
Shared: RPG · Story Rich · JRPG

The Test
Shared: Multiple Endings · Story Rich · Pixel Graphics

Legend of Mortal
Shared: RPG · Multiple Endings · Lore-Rich

Cyber Manhunt
Shared: RPG · Mystery · Detective

The Hex
Shared: Mystery · Story Rich · Indie

Disco Elysium - The Final Cut
Shared: RPG · Detective · Story Rich

OneShot
Shared: Story Rich · Indie · Pixel Graphics

Threefold Recital
Shared: Mystery · Detective · Lore-Rich

Sultan's Game
Shared: RPG · Story Rich · Strategy

Hero's Adventure: Road to Passion
Shared: RPG · Multiple Endings · Strategy

The Witcher 3: Wild Hunt — Remastered
Shared: RPG · Story Rich · Singleplayer

CHRONO TRIGGER®
Shared: RPG · JRPG · Story Rich

神都不良探 Underdog Detective
Shared: RPG · Story Rich · Mystery

Yes, Your Grace
Shared: RPG · Story Rich · Indie