Games like 秘封フラグメント
Games like 秘封フラグメント include No Case Should Remain Unsolved, GRIS, Firework, Hollow Knight: Silksong, and Tales of the Black Forest. We matched them by the tags players give 秘封フラグメント on Steam (Adventure, Visual Novel, Puzzle, 2D, and Text-Based): closest matches first, and among equally close ones the better-known games.

No Case Should Remain Unsolved
Shared: Puzzle · Visual Novel · Adventure

GRIS
Shared: Adventure · Female Protagonist · Indie

Firework
Shared: Puzzle · 2D · Indie

Hollow Knight: Silksong
Shared: 2D · Indie · Adventure

Tales of the Black Forest
Shared: Adventure · Visual Novel · Indie

LIMBO
Shared: Puzzle · Adventure · Indie

Rise of the Tomb Raider™
Shared: Adventure · Female Protagonist · Singleplayer

There Is No Game: Wrong Dimension
Shared: Puzzle · Adventure · Indie

Sanfu
Shared: Puzzle · Adventure · 2D

Chants of Sennaar
Shared: Adventure · Puzzle · Singleplayer

CrossCode
Shared: Puzzle · Female Protagonist · 2D

Tomb Raider Game of the Year
Shared: Adventure · Female Protagonist · Singleplayer

OPUS: Echo of Starsong - Full Bloom Edition
Shared: Visual Novel · Female Protagonist · 2D

Florence
Shared: Adventure · Indie · Female Protagonist

OPUS: Rocket of Whispers
Shared: Visual Novel · Adventure · Indie

Void Stranger
Shared: Puzzle · Adventure · 2D

Portal 2
Shared: Puzzle · Singleplayer · Female Protagonist

WITCH ON THE HOLY NIGHT
Shared: Visual Novel · Adventure · 2D

OPUS: The Day We Found Earth
Shared: Visual Novel · Puzzle · Adventure

Far Away
Shared: Visual Novel · Singleplayer · Female Protagonist

Deponia
Shared: Adventure · Puzzle · Singleplayer

Neva
Shared: Adventure · Puzzle · Indie

Urban Myth Dissolution Center
Shared: Visual Novel · Adventure · 2D

Samsara Room
Shared: Adventure · Puzzle · Indie