Games like 未了情书
Games like 未了情书 include Persona 5 Royal, Mirror 2: Project X, Persona 4 Golden, Sweet Home, and Volcano Princess. We matched them by the tags players give 未了情书 on Steam (RPG, JRPG, Wholesome, Lore-Rich, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Persona 5 Royal
Shared: JRPG · RPG · Multiple Endings

Mirror 2: Project X
Shared: Interactive Fiction · Female Protagonist · RPG

Persona 4 Golden
Shared: JRPG · RPG · Anime

Sweet Home
Shared: RPG · Female Protagonist · Interactive Fiction

Volcano Princess
Shared: RPG · Multiple Endings · Female Protagonist

Persona 3 Reload
Shared: JRPG · RPG · Anime

NieR:Automata™
Shared: RPG · JRPG · Female Protagonist

Persona 3 Portable
Shared: RPG · JRPG · Female Protagonist

Noctuary
Shared: JRPG · Interactive Fiction · Multiple Endings

Tales of Berseria™
Shared: JRPG · RPG · Female Protagonist

Aliya: Timelink
Shared: RPG · Interactive Fiction · Multiple Endings

Hyperdimension Neptunia Re;Birth1
Shared: JRPG · RPG · Female Protagonist

Vampires' Melody
Shared: Interactive Fiction · JRPG · Casual

Artis Impact
Shared: JRPG · Lore-Rich · RPG

Clair Obscur: Expedition 33
Shared: RPG · JRPG · Lore-Rich

Atelier Sophie 2: The Alchemist of the Mysterious Dream
Shared: RPG · JRPG · Female Protagonist

Tales of ARISE
Shared: JRPG · RPG · Anime

BLUE REFLECTION
Shared: JRPG · RPG · Female Protagonist

Metaphor: ReFantazio
Shared: RPG · JRPG · Anime

FINAL FANTASY® XIII
Shared: RPG · JRPG · Female Protagonist

月华辉映之刻
Shared: RPG · Female Protagonist · Multiple Endings

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Multiple Endings · Interactive Fiction · RPG

暴杀残雨之夜
Shared: RPG · Interactive Fiction · Multiple Endings

FINAL FANTASY XV WINDOWS EDITION
Shared: RPG · JRPG · Story Rich