I Got Reincarnated as a Cultist Mob in an Eroge Full of Maniacs with Death Wishes (Light Novel) - Vol. 4

The Aros Temple Cult is thrown into chaos by the betrayal of Oakley, a rising candidate for executive rank. After a brutal battle to the death against Karatena, he awakens with no memories, hunted not only by the Order's pursuers but by something far more terrifying.
Because the thing he fears most is himself.
A girl's voice echoes inside his head. Kill.
Guided by that mysterious whisper, Oakley heads for the Holy City, torn between the instinct to survive and the horror of uncovering his true identity.
Waiting in his path are three figures bound by obsession and secrecy. Marietta, a girl whose fixation burns with warped intensity. Father Dordon, a priest whose calm smile feels subtly wrong. And Joanne, who seems to understand everything yet chooses silence.
At the center of this suffocating three-way deadlock, one question remains. What future will Oakley choose, and what will it cost him?