14 games ranked by how much the tags Steam players vote on them overlap with Living With Sister: Monochrome Fantasy's. A rare tag counts for far more than one that sits on half the store, and popularity never moves a game up.
What they share most: Mature.

1·Lovelorn sanatorium Ⅲ
99% match · Mature
57% of 862 reviews positive

2·Niplheim's Hunter - Branded Azel
99% match
90% of 825 reviews positive

3·Pretty Neko
98% match · Mature
93% of 3,052 reviews positive

4·Chevalier Historie
97% match · Mature
81% of 430 reviews positive

5·Re:BF
97% match · Mature
82% of 281 reviews positive

6·Love Breakout
96% match
87% of 859 reviews positive

7·Brave Alchemist Colette
96% match
89% of 960 reviews positive

8·The Dead End
95% match · Mature
67% of 208 reviews positive

9·Hentai 3018
95% match
79% of 1,555 reviews positive

10·Demons Roots
95% match
93% of 2,447 reviews positive

11·Sakura Succubus
94% match · Mature
82% of 724 reviews positive

12·And the Hero Was Never Seen Again
94% match · Mature
89% of 369 reviews positive

13·NEOMORPH
93% match · Mature
76% of 696 reviews positive

14·Ruins Seeker
91% match · Mature
93% of 742 reviews positive
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The closest matches to Living With Sister: Monochrome Fantasy on Steam are Lovelorn sanatorium Ⅲ, Niplheim's Hunter - Branded Azel, Pretty Neko, Chevalier Historie, Re:BF. They rank highest because their Steam community tags overlap most with Living With Sister: Monochrome Fantasy's, and shared tags include Mature.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Mature count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Living With Sister: Monochrome Fantasy's. Popularity never affects the ranking.