Saw your comment on a story about how they offed Issei, which you said that they did it in a bad way, which I agree with because down the line, when Irina comes into play, she doesn't even acknowledge Issei as her childhood friend and claims that on the random OC. It's kind of dumb because it should mean that the random OC should be Issei's childhood friend and likely would have been hanging out with him, thus the death made no sense and is just rather lazy. I think the story is called DxD: I I Think I Got The Wrong Isekai System, literally, it is copy and paste.