Shin Megami Tensei Nocturne

Call it what you will-
a revelation from god, or a curse of the demon king
The fact remains that our world came to an end.

A heretic called upon an unearthly light,
and devastation ensued.

Chaos crawled out of the depths of the ocean,
from the black abyss.

Death upon death. ..
Nothing but death in this barren land.

Who can we pray to!
There are only demons and fiends here.

A voice in the dark beguiles me.

"Truth is a mystery, unravelled by the candles' flames."

---- From The Journal of a Man Who Wandered into Another World

In Tokyo, Japan, a high school student on his way to visit his teacher at the hospital meets a reporter who tells him a bizarre story about a recent clash in a local park, which the man believes is tied to the occult.

After the strange run-in, the boy arrives at the hospital in Shinjuku only to discover that the hospital is empty and his teacher is nowhere to be found. After wandering around the deserted building, the boy encounters a mysterious man in the basement. Shortly after, from the rooftop, he witnesses a catastrophic event--the Conception. The earth shakes and a bright light engulfs everything on the horizon. When the boy awakens, he finds his appearance drastically altered. As he wanders the hospital halls, he comes to realize that he has been turned into a demon.

In the aftermath of the destruction, the boy sets forth on a journey where he must battle against demonic forces to bring order to the chaos. The world awaits its rebirth, but will it ever be the same again?