I Entered a Horror Game, but the Dungeon Is My Hometown!

[Half-Infinite Flow, Growth-Oriented, Grudge-Holding, Split-Personality, and Masterful Acting Protagonist, No Romance]

Welcome to The Land of the Haunted:

At midnight,

the sound of high heels echoes through an empty corridor...

A skinned monster roams the school grounds...

The dead claw their way out of the earth where they lie...

"On my twentieth birthday, I orchestrated a terrorist attack against my father... With a gunshot, I entered this horror game, taking on the dual identities of a player and an anomaly."

"What, you say he isn't my biological father? That doesn't matter."

As the truth behind the game's existence gradually comes to light,

will he choose to stand with humanity or with the anomalies?