MIMESIS Derailment Update Arrives October 26 With New Maps and Monsters
The update adds content to a game whose core tension is not knowing whether the person in front of you is a teammate or a copy, and the same update breaks existing saves and pauses one mode.
Reporting from 1 source: Denfaminicogamer.
ReLU Games, co-publisher with KRAFTON, announced on October 22 that the major update Derailment for the co-op horror game MIMESIS arrives October 26, 2026 at 11:30 JST. The update adds maps, monsters, scrap, equipment, and traps, plus equipment and costume slots and UI improvements. The mimicking AI evolves further. A first anniversary event is planned. Existing save data will not carry over, and the Logistics Center mode pauses after the update.
The update lands at 11:30 JST on October 26, 2026. MIMESIS has been in Early Access on Steam since October 27, 2025, priced at 1,200 yen with tax included, and a microphone is required.
Players dodge contaminated rain, collect scrap inside buildings, and try to reach the tram at their base by midnight, while the Mimesis enemies copy voices, behavior, and memories. Derailment adds equipment and costume slots and reworks the UI alongside the new maps, monsters, scrap, equipment, and traps.
Two caveats come with it. Existing save data stops working after the update, and the Logistics Center mode is suspended for a while, though it can still be played by selecting the previous branch.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.