There is no official release for the Nintendo 3DS, though several community projects exist to bring the game to the handheld via homebrew and CIA files. Available Fan Versions & Methods
If you're looking into OMORI, here’s a quick breakdown of what makes it a "hot" topic in the indie scene: LordGandhii :: Review for OMORI - Steam Community omori 3ds cia hot
The 3DS is a lifestyle device. It sleeps instantly, fits in a jacket pocket, and has that satisfying snap-close. OMORI is a slow-burn game (50+ hours for true ending). Playing it in short bursts—checking on Basil’s garden, exploring the neighbor’s room, or battling a sprout mole—turns a heavy narrative into a portable ritual. There is no official release for the Nintendo
In the 3DS modding community, a .cia file is an installable package used by users with custom firmware (CFW) to add software directly to the system's home menu. Because an official version does not exist, any "OMORI.cia" file found today is either: The Clamshell Comfort Zone The 3DS is a lifestyle device
Because there is no official 3DS file, any "OMORI 3DS CIA" found online is likely one of the following fan-made alternatives: OMORI on 3ds (real) : r/OMORI