Games like Case 03: True Cannibal Boy
Games like Case 03: True Cannibal Boy include Volcano Princess, Magical Girl Witch Trials, Road to Empress I, Scarlet Hollow, and Mirror 2: Project X. We matched them by the tags players give Case 03: True Cannibal Boy on Steam (Multiple Endings, Female Protagonist, LGBTQ+, Visual Novel, and Choices Matter): closest matches first, and among equally close ones the better-known games.

Volcano Princess
Shared: Multiple Endings · Female Protagonist · Choices Matter

Magical Girl Witch Trials
Shared: Female Protagonist · Visual Novel · LGBTQ+

Road to Empress I
Shared: Female Protagonist · Choices Matter · Multiple Endings

Scarlet Hollow
Shared: Visual Novel · Choices Matter · Multiple Endings

Mirror 2: Project X
Shared: Female Protagonist · Visual Novel · Multiple Endings

The Cosmic Wheel Sisterhood
Shared: Female Protagonist · LGBTQ+ · Visual Novel

Sweet Home
Shared: Female Protagonist · LGBTQ+ · Visual Novel

VA-11 Hall-A: Cyberpunk Bartender Action
Shared: Visual Novel · Female Protagonist · LGBTQ+

Life is Strange Remastered
Shared: Female Protagonist · Multiple Endings · Choices Matter

Life is Strange: True Colors
Shared: LGBTQ+ · Female Protagonist · Multiple Endings

BAD END THEATER
Shared: Multiple Endings · LGBTQ+ · Visual Novel

Undertale
Shared: Multiple Endings · Choices Matter · Story Rich

Lost Records: Bloom & Rage
Shared: Female Protagonist · LGBTQ+ · Choices Matter

Tales of the Black Forest
Shared: Female Protagonist · Horror · Visual Novel

The Chrono Jotter
Shared: Female Protagonist · Visual Novel · LGBTQ+

Far Away
Shared: Visual Novel · Choices Matter · Female Protagonist

The Test
Shared: Multiple Endings · Choices Matter · Visual Novel

Oxenfree
Shared: Female Protagonist · Choices Matter · Story Rich

Love Curse: Find Your Soulmate
Shared: Female Protagonist · LGBTQ+ · Visual Novel

The Coffin of Andy and Leyley
Shared: Multiple Endings · Visual Novel · Choices Matter

Refind Self: The Personality Test Game
Shared: Female Protagonist · Visual Novel · Story Rich

The Test: Hypothesis Rising
Shared: Multiple Endings · Choices Matter · Visual Novel

Danganronpa V3: Killing Harmony
Shared: Female Protagonist · Visual Novel · Story Rich

彷徨之街 The Street of Adrift
Shared: Female Protagonist · Visual Novel · LGBTQ+