After being reborn, Nioh Masaharu noticed something strange. He could see some people hanging from strings descending from the sky, like puppets. So one day, he went to visit an acquaintance who was his senior.
Iori: "Don't bother trying. You can't touch them, Nioh-kun, a character outside the story."
Nioh narrowed his foxlike eyes and smiled. Puri. Looks like someone has the answers.
From then on, the two of them set about cutting the strings, leading to all kinds of chaotic antics.
First time writing. The prose isn't great, the characters may be OOC, and I haven't researched the details. Read at your own risk. Updates whenever inspiration strikes.
Theme: Maybe it's a Mary Sue story?