LiTMUS Co., Ltd. (Head Office: Minato-ku, Tokyo; President: Soichiro Kuwamura) and Regista Co., Ltd. (Head Office: Shibuya-ku, Tokyo; Representative: Kuniharu Hosoda) are pleased to announce that the Steam® version of “Another World Series -Slit Mouth Woman VS AOONI-”, the first title in the “Another World Series” where players travel between the real world and another world to solve mysteries, has been officially announced today.
■“Another World Series -Slit Mouth Woman VS AOONI-” Launch Campaign
1) “Launch Commemorative Sale” will be held.
A 25% off sale will be held for a limited time after the release. Please take this opportunity to purchase the product.
Sale price: $13,49
Sale Ends June 25th at 9:59am PDT.
*The period is subject to change without notice.
2) New trailer movie released
YouTube：https://youtu.be/t4eIbSeDjtg
Both live video and live streaming of “Another World Series -Slit Mouth Woman VS AOONI-” are welcome.
*No prior permission is required.
*Free to distribute (can be publicized up to the ending).
*Monetization is allowed.
We hope that you will not violate public order and morals, social conventions, or the terms and conditions of the distribution platform.
■“Another World Series -Slit Mouth Woman VS AOONI-” Game Outline
This is the first work in the “Another World Series” in which a mystery is unraveled while traveling back and forth between the other world and the real world.
Akashi Asanagi, a university student, wakes up on the 10th floor of an abandoned hospital.
While strolling around the hospital, he encounters a blue monster called “AOONI” and when he touches the mask dropped by AOONI the hospital turns into an alley,
There, he encounters a knife-wielding demoness, “Slit Mouth Woman”.
Akashi is attacked by two beings, but somehow a battle between Slit Mouth Woman and AOONI breaks out and ......?
Schools, cemeteries, and residences......
Explore various different worlds on different levels and use items and gimmicks to solve the mystery of the abandoned hospital.
This title is a Puzzle solving 3D horror action adventure with multiple endings.
Each level features a fully voiced adventure part with unique characters.
What is the fate that awaits Akashi and his friends after they conquer all 10 stages?
Find out the truth with your own eyes.
■The ending changes depending on the player's actions in the game!
The ending of the game diverges depending on the player's choices and other factors.
Mysteries are revealed as you run for your life.
You will see the worst ending or the other ...
■What is “Another World Series -Slit Mouth Woman VS AOONI-”?
The game is a first-person, Puzzle solving 3D horror action adventure in which the main characters are lost in a mysterious space where other worlds and reality intersect, and are pursued by a wide variety of deformities as they try to solve the mysteries. The game will be developed in collaboration with Japanese ghost stories and urban legends, as well as popular horror titles.
As the first of these collaborations, a special story will be developed in which “Slit Mouth Woman” one of the most popular urban legends, and “Ao Oni” a popular horror IP, will appear together in an alternate world. Players will join the characters who have wandered into an abandoned hospital, and will be challenged to solve numerous mysteries while escaping the oncoming horror.
■What is “Ao Oni”?
“Ao Oni” first appeared as a free game in 2004, attracting attention with its strong presence of an Ao Oni that suddenly appears and its tense, hand groping puzzle-solving elements, and became a hot topic mainly on Niconico and YouTube. The game has since been followed by a series of smartphone apps and remakes, and the total number of downloads of the series has exceeded 34 million, The global attention has also increased significantly with the release of the Steam® version in July 2024, The Nintendo Switch™ version, which was released in the same period, ranked No. 1 in the Nintendo eShop's downloadable software ranking, and has also gained high popularity in the PC and consumer domains. On April 25, 2025, the company released its latest title, “Aooni The Horror of Blueberry Onsen” on Nintendo Switch™ and Steam®.
■Work Information
Title: “Another World Series -Slit Mouth Woman VS AOONI-”
Genre: Puzzle solving 3D horror action adventure
Release model: PC (Steam®), Nintendo Switch™
Number of players: 1
Release Date
Steam®: June 12, 2025 (Thursday)
Nintendo Switch™: May 29, 2025 (Thursday)
Retail price Steam®: $17,99 *Price will be reduced by 25% to $13,49 during the launch commemorative sale.
Supported languages: English, Japanese
【Steam® Store Page】
https://store.steampowered.com/app/3586070
【Nintendo of America URL】
https://www.nintendo.com/us/store/products/another-world-series-slit-mouth-woman-vs-aooni-switch/
【Nintendo of Europe URL】
https://www.nintendo.com/en-gb/Games/Nintendo-Switch-download-software/Another-World-Series-Slit-Mouth-Woman-VS-AOONI-2835904.html?s=countries
[LiTMUS Co., Ltd.]
Location: 28F Midtown Tower, 9-7-1 Akasaka, Minato-ku, Tokyo 107-6228, Japan
Representative: President Soichiro Kuwamura
Date of Establishment: June 2021
Corporate Site: https://litmus-ent.jp/
[Regista Co., Ltd.]
Location: 201 KI Building, 3-20-2 Higashi, Shibuya-ku, Tokyo
Representative: Kuniharu Hosoda
Date of Establishment: January 25, 2001
Business: Planning, production, sales, import/export, etc. of game software.
Corporate Site: http://regista.co.jp/
English Corporate Site: https://regista.co.jp/en/
Official X: https://x.com/PR_Regista/
English Official X: https://x.com/Regista_ENG
[Inquiries regarding this matter]
Form: https://regista.co.jp/contact/
Regista Public Relations: Hosoda