In a crossover world, Kiyotaka Ayanokoji encountered the soul of a transmigrator at the age of twelve and learned about his future. That same year, he pretended to be an orphan and was adopted by a couple named Hikigaya, who gave him the name Kiyotaka Hikigaya.
He got an ex-girlfriend named Yukino Yukinoshita, and met the celebrity Mai Sakurajima dressed as a bunny girl at a train station. His sister-in-law, Haruno Yukinoshita, who had always hated him, became the kitten he kept. Just as he was thinking that his life was stranger than the original, a daughter from their future suddenly appeared at Rio Futaba's house, even though she had always thought their friendship could last forever.
(Abandoned by an author who has stopped updating. Updates whenever. No need to send me blades anymore. You'd just be wasting your money since I can't get it.)