Games like Kiss/OFF
Games like Kiss/OFF include Date Everything!, Monster Prom, Our Life: Beginnings & Always, Class of '09: The Re-Up, and The Hungry Lamb: Traveling in the Late Ming Dynasty. We matched them by the tags players give Kiss/OFF on Steam (Dating Sim, Visual Novel, Choose Your Own Adventure, Aliens, and Comedy): closest matches first, and among equally close ones the better-known games.

Date Everything!
Shared: Dating Sim · LGBTQ+ · Comedy

Monster Prom
Shared: Dating Sim · Comedy · Visual Novel

Our Life: Beginnings & Always
Shared: Visual Novel · Dating Sim · LGBTQ+

Class of '09: The Re-Up
Shared: Visual Novel · Comedy · Choose Your Own Adventure

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Dating Sim · Interactive Fiction

Lay a Beauty to Rest: The Darkness Peach Blossom Spring
Shared: Visual Novel · Mystery · Adventure

Hooked on You: A Dead by Daylight Dating Sim™
Shared: Dating Sim · Visual Novel · Choose Your Own Adventure

Love Is All Around
Shared: Dating Sim · Visual Novel · Choose Your Own Adventure

1 to 1 humanoid edible toys
Shared: Visual Novel · Dating Sim · LGBTQ+

Otaku's Adventure
Shared: Dating Sim · Visual Novel · Adventure

Monster Prom 3: Monster Roadtrip
Shared: Visual Novel · Dating Sim · Comedy

LoveChoice
Shared: Dating Sim · Visual Novel · Multiple Endings

Monster Prom 2: Monster Camp
Shared: Dating Sim · Comedy · LGBTQ+

Sweet Home
Shared: Visual Novel · Dating Sim · LGBTQ+

Hatoful Boyfriend
Shared: Dating Sim · Visual Novel · Comedy

Senren * Banka
Shared: Dating Sim · Visual Novel · Anime

I Wani Hug that Gator!
Shared: Visual Novel · Choose Your Own Adventure · Dating Sim

恋爱绮谭~不存在的夏天~
Shared: Visual Novel · Mystery · LGBTQ+

Monster Prom 4: Monster Con
Shared: Visual Novel · Dating Sim · Comedy

Tricolour Lovestory
Shared: Dating Sim · Visual Novel · Simulation

Rewrite+
Shared: Visual Novel · Dating Sim · Choose Your Own Adventure

Gaokao.Love.100Days
Shared: Dating Sim · Visual Novel · Simulation

Lucy -The Eternity She Wished For-
Shared: Visual Novel · Dating Sim · Anime

Vampires' Melody
Shared: Visual Novel · Dating Sim · Adventure