Board Thread:Questions and Answers/@comment-39066076-20190408023847/@comment-34974603-20190409072813

"Technically". You basically need to play through the game without killing anything. ''Ever. '' If you kill literally anything, then you immediately fail the Pacifist Route.

Also, you need to become true friends with a certain three people. I can't really tell you who or how without spoiling, but try backtracking. If you can't find them, then just keep progressing the main story and you'll be given advice on what to do.