Konosuba: A CPU's Battle with an Innocent Sin

A/n: Would not recommend reading if you've not seen Deadpool and Wolverine.

After the defeat of the Demon King, the members of Y/n and Kazuma's party all go their own separate ways, with Y/n taking up a role he never would've thought he'd do. But he is forced to go back when he learns his world is about to die.

But he can't do it with his friends, since they aren't able to join him. The only way to do it is with an Innocent Sin. One who was often the victim of misunderstandings, accusation, harassment, all from a young age.

Can this unlikely duo save the multiverse, or will everything they love die with them being the only Remnants?