This is Day 1! Craft Build Survive | No One Survived Gameplay
The file name you mentioned refers to of a multi-part RAR archive for the Portable version of the game. Portable versions are often unofficial "pre-installed" versions designed to run without a standard installation process. The version v0.0.2.9 is an early access build; more recent updates have migrated the game to Unreal Engine 5 for significantly improved graphics and larger maps. No One Survived Portable v0.0.2.9.part6.rar
The "story" is one of constant physiological pressure. You must monitor your character's needs—hunger, thirst, and fatigue—at all times, as failing to do so leads to a swift death. This is Day 1