Rikka: Yuta~ Is your Sharingan about to evolve into a Mangekyo?!
Uchiha Yuta toyed with the kunai in his hand, lightly touched his three-tomoe Sharingan, then narrowed his eyes and gazed at Rikka's adorable face.
"Hey~ Rikka, would you help me evolve my Sharingan into a Mangekyo?"
"Of course! The Evil Eye has forged an eternal pact with the Sharingan!"
"All right~ Let's begin!"
He raised the blade.
It came down.
Actually, this is a perfectly ordinary crossover slice-of-life story.
Chunibyo, Gabriel DropOut, Miss Kobayashi's Dragon Maid, Himouto! Umaru-chan, An Angel Flew Down to Me, Non Non Biyori, Neighbor Sophi, K-On!, The Great Jahy Will Not Be Defeated!, and other slice-of-life series all make appearances.
After 400,000 words, the story starts traveling to other worlds. Worlds so far: KonoSuba: God's Blessing on This Wonderful World! → Girls' Last Tour → Is It Wrong to Try to Pick Up Girls in a Dungeon? (traveling back and forth) → A Certain Scientific Railgun / A Certain Magical Index → slice of life
It's so cruel to stab your own woman in the back just to evolve.