Known as Mountains of Madness: Summit of Deities in English, is an original scenario created for the Call of Cthulhu TRPG format by Madaraushi. The setting is based on H.P. Lovecraft's story, At The Mountains of Madness, and concerns a climbing expedition up the tallest (fictional) mountain in the world. In addition to the players' own created characters, they are joined by three NPCs: Kevin Kingston (also known as K2), Hotaka Azusa, and Kosy Uszko.
In October 2021, a crowdfunding campaign was launched on Campfire in order to secure funding for an animated adaptation of the scenario. The project surpassed its goal by 1491%, confirming the production of Kyouki Sanmyaku: Naked Peak.