There Is a Succubus in My Room: A Succubus Reverse Isekai Harem LitRPG

Who This Book Is For

Readers who want a comedy-forward reverse isekai with succubus heat, genuine character chemistry, and a mystery hook that builds across the series

Who This Book Is NOT For

Anyone looking for crunchy LitRPG stat panels or dungeon-crawl action — this is a slice-of-life harem with light progression, not a mechanics-heavy grind

Our Review

The Setup

Jake Morrison is a 24-year-old remote IT worker who comes home to find a woman collapsed on his apartment floor. She has small horns. And a tail. Her name is Lyra, she is a succubus, and she has absolutely no idea how she ended up on Earth.

What follows is exactly what you hope it will be. Lyra is starving because succubi feed on sexual energy, and she is too embarrassed to explain this until desperation overrides shame. Jake, being a fundamentally decent person, helps her. The premise is simple, but the execution is where Thornvale earns the rating. The comedy hits immediately — Lyra does not understand refrigerators, is overwhelmed by forty types of bread at the grocery store, and tries to pay with demon realm currency that turns out to be worthless rocks.

Then Cherry crashes onto the balcony. Pink hair, heart-shaped pupils, curves that should not exist outside anime, and absolutely zero concept of human shame. Her first instinct is to strip. Her passive corruption aura makes the mailman confess his feelings for the neighbor. She accidentally adopts a dog named Kevin. The household dynamic goes from sweet to chaotic overnight, and the book is better for it.

What Works

The comedy is the real draw, and it lands consistently. This is not a book where humor is sprinkled between plot points — the humor IS the plot. Lyra and Cherry comparing notes on human confusion (“You ASK? With WORDS?”), Cherry’s bafflement at clothing as a concept, the sheer domestic chaos of two supernatural women learning to navigate an apartment — Thornvale has a genuine ear for comedic timing that most harem authors do not possess.

The two succubi are perfectly contrasted. Lyra is sweet, grateful, easily flustered, and devoted. Cherry is bubbly, boundary-free, and leaves chaos wherever her tail swishes. Putting them together in one apartment creates a dynamic that never gets stale because their reactions to every situation are completely different.

Jake himself is refreshingly normal. He is not secretly powerful or prophetically chosen (yet). He is just a guy who found a demon woman on his floor and decided to help. His decency is the foundation of every relationship in the book, and it makes the bond progression feel real rather than transactional.

The mystery threading is subtle but effective. Glowing seals appear on the succubi during intimate moments. Jake has been dreaming about the same patterns before any of this started. The Warden scout who shows up late in the book is just enough threat to remind you this story has stakes without derailing the comedy tone. The final line — “If two came because of me… how many more are out there?” — is a perfect series hook.

What Doesn’t

The light LitRPG system is genuinely light. Adaptation percentages and Bond Strength numbers appear sparingly, and readers who want the full stat-panel experience will find this closer to urban fantasy with a System flavor than a true LitRPG. That is clearly intentional given the comedy-first tone, but it is worth flagging if you are coming from Thornvale’s more mechanics-heavy series.

At only 19 ratings, this book has not found its full audience yet, which is a shame. The lower visibility means some readers might skip it, but the 4.5 average and 67% five-star breakdown tell you everything you need to know about reader satisfaction.

The Heat

Spice level is a 4 out of 5. The book delivers five explicit scenes plus softer fan-service beats, and each one feels distinct because Lyra and Cherry bring completely different energies. Lyra’s scenes are tender and emotionally charged, building toward a discovery moment that genuinely surprises her and shifts the dynamic. Cherry’s rooftop exhibition scene is pure uninhibited enthusiasm that matches her personality perfectly. The threesome finale brings both energies together and ties into the seal mystery in a way that makes the heat serve double duty as plot advancement. The consent is always explicit and verbal without interrupting the flow.

Bottom Line

There Is a Succubus in My Room is a book that succeeds on charm. The fish-out-of-water comedy is the best in the harem space right now, the two leads are distinct and likeable, and the reverse isekai premise gives the whole thing a freshness that standard portal fantasies cannot match. The lighter LitRPG system will not satisfy readers who want dense progression, but that is a feature, not a bug — it keeps the focus on character and comedy where this book excels. With two books in the series and clear momentum toward a larger story, this is an easy Editor’s Pick for anyone who wants their harem fiction with a genuine sense of humor.

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