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Mature Content Description

The developers describe the content like this:

This game is an adult-only visual novel containing frequent explicit sexual content, nudity, and uncensored sexual dialogue involving adult characters. All characters who participate in sexual content are adults.

Explicit sexual content includes oral sex and deep-throat fellatio, vaginal intercourse in multiple positions, breast sex (paizuri), nipple stimulation, footjobs, semen ejaculation into the mouth and swallowing, internal ejaculation/creampies, repeated orgasms, and multi-partner/harem sexual activity. Some scenes also contain impregnation/breeding-themed dialogue, although no pregnancy is depicted as a gameplay mechanic.

The game's central premise involves a supernatural hot spring that gives the male protagonist powerful pheromones. These pheromones involuntarily cause adult women around him to become intensely sexually aroused and reduce their normal restraint and judgment. Several heroines initially dislike or reject the protagonist before exposure to the pheromones, and then initiate or explicitly request sexual activity after becoming affected.

Because the characters' sexual arousal and judgment are altered by a supernatural influence, the game contains dubiously consensual / coercive sexual themes. The story does not present the pheromone effect as an ordinary unaffected state of consent. After being affected, the heroines actively participate in and verbally request the depicted sexual acts.

One heroine is an adult livestreaming influencer, and part of her sexual encounter occurs while her fictional livestream is still active. The scene includes references to viewers/listeners and exhibitionistic sexual behavior. This is entirely fictional and does not involve real players, user-generated content, or online interaction.

Sexual scenes are presented with adult CGs and animation. Genital areas are visually censored with mosaic censorship, while the sexual dialogue and voice acting are not censored with audio beeps.

The game does not contain sexual content involving minors. It does not contain gore, graphic physical violence, drug- or alcohol-induced sexual activity, or self-harm.

About This Game

Takashi has never had any luck with women.

But after stumbling upon a mysterious hidden hot spring, he emerges with endless stamina—and powerful pheromones that make the women around him go wild.

A fox deity, a bratty gyaru influencer, a tough massage therapist, and a seductive widowed innkeeper...

The women who wanted nothing to do with him are suddenly all over him.

Pheromone Onsen is a linear adult visual novel built around one simple fantasy: no route grinding, no complicated choices—just a fast-paced story packed with fully voiced, animated adult scenes and an escalating hot spring harem.

Features

🔞 No Routes. No Grinding. Just Enjoy the Story.

No complicated branching paths, affection meters, or flag management.

Just click, relax, and enjoy a straightforward story that moves quickly from one steamy encounter to the next.

🔞 Fully Voiced Adult Scenes

All four heroines are fully voiced, including their intimate scenes.

There are no censor beeps or muted adult dialogue, so you can enjoy the performances without awkward audio interruptions.

🔞 Four Heroines, One Hot Spring Harem

Takashi's mysterious pheromones turn his lonely vacation upside down.

Enjoy intimate encounters with four very different women:

• a mischievous fox deity

• a bratty gyaru influencer

• a tough, tomboyish massage therapist

• an elegant widowed innkeeper

And when the story reaches its climax, all four heroines come together for a full harem encounter.

Story

Suzuki Takashi is a hopeless virgin with absolutely no luck with women.

After winning a pair of tickets to a hot spring inn in a local shopping-district lottery, he heads there alone—because, naturally, he has nobody to bring with him.

His destination is Haremukan, a traditional hot spring inn filled almost entirely with women.

For a moment, Takashi thinks his luck may finally be changing.

It isn't.

A gyaru influencer tells him to stay out of her livestream.
A sharp-tongued massage therapist treats him like an annoyance.
Only the elegant innkeeper shows him any kindness.

Humiliated and desperate to get away from everyone, Takashi wanders deep into the inn and hears a mysterious voice calling to him.

It leads him to a hidden men-only bath:

The Pheromone Hot Spring.

According to an old sign beside the bath, its waters can dramatically increase a man's stamina—and cause him to emit pheromones powerful enough to drive women into intense arousal.

Takashi assumes it's nonsense.

Then he gets in.

The moment he leaves the bath, everything changes.

The gyaru who couldn't stand him.

The tough massage therapist who treated him like dirt.

The refined widowed innkeeper.

One after another, the women around him begin reacting to his newfound pheromones.

And thus begins Takashi's unbelievable new life at the ultimate hot spring harem♡

Characters

◆ Suzuki Takashi — The Protagonist

A hopeless virgin who has spent his life being ignored—or outright rejected—by women.

After bathing in the mysterious Pheromone Hot Spring, Takashi gains incredible stamina and powerful arousal-inducing pheromones.

Suddenly, the same women who wanted nothing to do with him can't seem to stay away...

◆ Mikoto — Fox Deity of the Hot Spring

"Your pheromones are simply too powerful... Even I have been affected. My body has grown so terribly hot... ♡"

A fox-eared local deity who resides at Haremukan.

Mischievous, old-fashioned, and completely removed from modern common sense, Mikoto is the one who guides Takashi to the mysterious hot spring.

She intended to have a little fun with him herself...

but even she wasn't prepared for just how powerful his new pheromones would become.

◆ Koganei Mocha — Bratty Gyaru Influencer

"Come on... mess me up even more... ♡"

A fashionable gyaru influencer traveling from hot spring to hot spring while livestreaming her adventures.

At first, she sees Takashi as nothing more than an irritating loser ruining her shot.

Then she catches his scent.

Even with her camera still rolling, her attitude quickly begins to change...

◆ Yushima Akane — Tough-Girl Massage Therapist

"I'll loosen you up all the way to the base... with my pussy♡"

A competitive, tomboyish massage therapist with a rough mouth and an even rougher attitude.

She isn't happy about having Takashi as a customer—but once his pheromones begin affecting her during the massage, her professional composure doesn't last long.

◆ Harumi Shino — Seductive Widowed Innkeeper

"It has been so long since I lost my husband... but tonight, I simply cannot restrain myself... ♡"

The elegant and alluring widow who runs Haremukan.

Unlike the other women, Shino treats Takashi kindly from the moment he arrives.

But late that night, she visits his room with desires she can no longer keep suppressed...

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Generative AI tools were used during development to assist in the creation of some visual assets, video/animation materials, and localization text included in the game. AI-generated material was used as source or base material and was reviewed, edited, adjusted, and finalized by the development team before being included in the final product.

The game does not generate any content using AI while the game is running. There is no Live-Generated AI functionality and players cannot submit prompts to a generative AI service through the game.