Updated Aug 29, 2026 · v1.0.14
A Japanese-style idle management game where you raise a hot spring inn with kappa and snow women. The inn grows even when you're away, and new rooms and views are unlocked each time you rebuild. No gacha or paid currency.
Develop a hot spring inn with yokai (Japanese supernatural beings). "Hyakki Onsen" is a Japanese-style idle game (incremental management simulation) where you rebuild a dilapidated inn with kappa (water goblins) and snow women. Even while you're away, hot spring gems accumulate, the inn grows, and your yokai encyclopedia fills up. Each time you rebuild, the inn's scenery changes, and new guest rooms open up—a relaxing idle management game. No gacha (loot boxes). No paid currency. Ads are only for those who want to see them. --Near the mountains, there's a dilapidated inn. There's no manpower. There are plenty of non-human beings, though. Kappa polish the baths, monster cats lay out the futons, and lantern ghosts beckon guests from the night road. As the inn's owner, you must stand firm at the front desk. Even if you do nothing, hot spring gems (the game's points) accumulate. Whether you're sleeping or working, the yokai are working. They have worked for a thousand years. You shouldn't feel guilty about taking a break. ■ The employees are yokai. Forty of them. Forty yokai, each with a different role and personality—bathhouse attendant, maid, chef, gatekeeper, zashiki-warashi (house spirit)—are compiled in the "Yokai Records," complete with their individual illustrations and descriptions. The Akaname licks the grime from the bathwater to polish it. It doesn't consider it cleaning; it's just a late-night snack. The Amanojaku attracts customers by saying, "Don't ever come!" A genius at reverse advertising. ■ The scenery changes with each rebuild. When the inn has matured, "rebuild." With permanent enhancement through spiritual power, the next inn will grow faster and bigger. With each succession of ownership, the inn's illustration changes from the first to the sixth generation, cherry blossoms, fireflies, maple leaves, snow, moon—with each generation, new guest rooms can be constructed. ■ Hospitality in Fifteen Seconds Occasionally, you'll encounter guests with a peculiar personality. "The dark road is unsettling. Could you come and meet me at the entrance?"—Now, who will you send out? This game's only reflex is choosing the right yokai to match the guest's wishes. Even if you get it wrong, your inn won't go bankrupt. Rarely, you'll see special guests such as demon lords or messengers of the dragon god. If you serve them well, you'll be rewarded lavishly. ■ Instead of Gacha, there's matchmaking. New yokai are welcomed at the "Shrine of Matchmaking." The candidates change weekly. Choose one you like, and offer your Yokai Energy (which accumulates as you play), and that yokai will definitely become your ally. Instead of the fun of drawing, we've replaced it with the fun of choosing. ■ Yu-Tama accumulate. Enjoy the ultimate inflation. Yu-Tama will exceed hundreds of millions, then trillions, and eventually reach the capital. The developers tested the growth curve for 90 days using an economic simulator. Based on that, they gave up on balancing the game. Even if you accumulate resources, inflation makes them less useful. But for some reason, it's still enjoyable. ■ Your Inn's Progress Becomes a Title. "The Bonds of the Five Demons," "A Hundred Demons in Full Bloom"—your inn's progress is recorded in 37 achievements, and upon completion, you can proudly display the title beneath your inn's curtain. ■ About Your Wallet ・There is no gacha. ・There are no "stones" or "gems." You cannot buy bath orbs with real money. They aren't even sold. ・Ads are reward-based, viewable only by those who want to see them. There are no banners or forced videos. ・The only in-app purchase is the "Ad-Free Charm" (a one-time purchase that allows you to receive the benefits of ads without watching them). ・There is no stamina system or time-limited events. Nothing will rush you. * Your thank-you gift (login bonus) will not reset to day one, even if you take a break. Please continue from where you left off. ■ For those who: * Are tired of the "feeling of being chased" in social games * Want a relaxing visual experience, but also the satisfaction of seeing numbers increase * Are tired of the "pity system" in gacha games (We don't have a pity system. There's only the floor) * Love ink paintings, gold leaf, and Japanese-style yokai paintings * Want to return to being a ryokan owner for just 5 minutes a day Morning bath, midday bath, evening bath. The water temperature is always just right. Welcome back. *Screenshots and numbers are from a development version.
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