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Under Mythos puts a cozy hot spring inn on top of an extraction RPG and Cthulhu madness
Under Mythos begins with an almost aggressively comforting idea: a small cat works at a hot spring inn for strange visitors while searching for its mother. Then KADATH starts pulling at the scenery. Dungeon runs are built around extraction risk, the guests can mutate, the protagonist is tied to Nyarlathotep, and the peaceful world is supposed to slide gradually into madness.
By Kader Under Mythos 
The newly established KADATH revealed its first project on September 10. Under Mythos is scheduled for PC and Nintendo Switch in 2028, with no narrower release window announced.
KADATH is led by producer Yoichi Miyaji, whose credits include the LUNAR and GRANDIA series. His new company is deliberately approaching original JRPG development through a smaller, project-based structure that brings creators from different companies together.
The cozy premise is hiding some very old gods
The protagonist enters another world looking for Mother and reaches a mysterious hot spring inn. Its owner offers a simple bargain: work there and perhaps a reunion will become possible.
The announcement keeps that setup deliberately gentle. Miyaji's Game*Spark interview fills in the uncomfortable part. The cat is Nyarlathotep, reinterpreted by character designer Atsuko Nishida, while the maternal figure at the center of the search is connected to Azathoth.
That makes the tonal collision more than marketing artwork. KADATH wants the familiar inn and its charming residents to become increasingly unstable as the story advances.
Dungeon runs are about deciding when to come home
Guests need food and materials, so the player travels through gates into other areas, searches dungeons and fights grotesquely transformed enemies in real time.
KADATH specifically describes the exploration structure as extraction rather than roguelike progression. Gathering more valuable resources means staying out longer and accepting additional risk before returning safely to the inn.
Some missions revolve around materials. Others lead toward bosses. Miyaji says action combat was chosen because repeatedly stopping the game for separate battles would work against the physical rhythm the team wants.
The hot spring is also a mutation system
Resources collected outside can apparently be added to the baths. Doing so may cause characters to mutate, changing their appearance, abilities and combat skills.
The same ingredient will not necessarily produce the same result every time. KADATH is experimenting with randomness here, although Miyaji says unsuccessful outcomes should not simply waste the player's time.
He compares the intended feeling to discovering rare equipment in Diablo: curiosity and the possibility of an unusually good result. Under Mythos is planned as a conventional paid game rather than a monetized gacha system.
Do not expect a hardcore hotel spreadsheet
The official description calls the design “hot spring inn management x extraction,” but Miyaji gives the management half a softer definition.
Players help the inn's staff and bring back whatever resources are required instead of running every operational detail. Developing the inn unlocks encounters, while relationships with visitors can reveal their true forms and produce requests that eventually lead back into the dungeons.
The inn is therefore closer to a narrative hub tied directly to exploration than a separate business simulator.
The creative team is unusually recognizable for a project this early
Atsuko Nishida, known for her work designing numerous Pokémon, is handling character design. Takumi Miyajima, whose writing credits include Tales of the Abyss, is working on the scenario.
Noriyuki Iwadare provides the music after composing for series including GRANDIA, LUNAR and Ace Attorney. His early work on Under Mythos already plays with the central contrast, shifting from lightly Japanese-influenced music toward rapid jazz as the protagonist's state changes.
Miyaji is producing the project.
There is a large warning label attached to the 2028 promise
Under Mythos is still preparing its vertical slice. KADATH says that build is intended to demonstrate the target quality of the final game's visuals, audio and core mechanics.
The company is openly seeking development partners for the vertical slice and the longer production that follows. The publisher has not been finalized in the announcement material.
Miyaji also says parts of the scenario remain at an early stage. Even some of the more unusual systems being discussed publicly should therefore be treated as development intentions rather than finished mechanics.
That makes Under Mythos less a near-future release than a very public pitch for what KADATH wants to build: a Japanese JRPG where an adorable cosmic horror works at an onsen, hunts resources in dangerous dungeons and occasionally mutates in the bath.