The story follows a guy named Pasha, whose friends have mysteriously disappeared.
In his attempt to find them, he clashes with the police officer handling the missing persons case.
As a result of this confrontation, he ends up confined to a psychiatric hospital.
After spending just one day there, Pasha mysteriously finds himself in a camp familiar to all of us.
Everything might seem fine, but his peaceful life is constantly disrupted by Hat — a second personality living inside him.
Hat never misses a chance to seize control of Pasha’s body, and his antics usually get Pasha into serious trouble.

[Translated from Steam]

The Remaster, despite following the same overall plot, offers a polished script by removing, adding, and changing many details throughout the narrative, resulting in a much different feel of the story. It also changes the role of some side characters, adds a narrator, and, most importantly, entirely replaces the original ending and its DLC.