Transmigrating to Another World: My Bonded Spirit Weapon Is Heavenly Fire

(Partly original, original setting, a bit of a mashup, transmigration)

After an accident, Chen Mu, Chen Yifan, Su Shu, and Tao Xing were hit by a truck and sent to another world.

A catastrophe known as the Honkai is ravaging that world, and Chen Mu has become Kevin, bearing the mark of salvation.

Can the four protagonists put an end to the Honkai and fulfill their responsibilities as outsiders?