Marvel's Berserker pleads to die

A "mang" character runs through the whole text!
……
Travel to the world of Marvel.
"Ding! The system is successfully bound, welcome..."
Protagonist: "Shut up, I'm going home."
"Ding! Release the ultimate mission: Warrior's Glory
Mission Requirement: Die in an all-out battle
Reward: Return to the original world"
……
Because of the temptation to go home, there is one more Berserker in the Marvel world who is looking for opportunities to die in battle.
but……
The protagonist looked at the corpses of the villains and scratched his head in confusion.
How can you not die?
(If the timeline plot changes or something, it's considered a parallel universe)

Key words of the novel: Berserker in Marvel asks for death without pop-up window, Berserker in Marvel asks for death