A comparison of in the manga vs. the anime?

Danny, the floor guardian with an obsession for eyes, provides a grotesque secondary antagonist that sets the bar for the "bosses" Rachel and Zack will face. Final Verdict

Fans of the game will find the adaptation remarkably accurate, from the typewriter save points to the specific layout of Danny’s clinic.

As a first episode, "1x1" handles the "Floor B5" arc with surprising efficiency.

The episode ends with the foundational promise that defines the series: Rachel will help Zack escape if he promises to kill her once they are out. Pacing and Adaptation

Introduced as a scythe-wielding maniac, Zack brings an over-the-top, almost campy energy that balances the slow-burn psychological tension.