“I'll make you happy for the rest of your life, so please accept all of me.” Without a single living relative, Naoto devotes his life to work. One day, while returning home after doing overtime, Naoto gets summoned into a different world. As Naoto watches his life unfold like a surreal manga or anime, the Prince who summoned Naoto threatens to kill him due to a misunderstanding. A Dragonfolk by the name of Rino comes to Naoto’s rescue. “You're my Fated Partner,” said Rino, as he carries Naoto off. However, Rino is set to turn 100 years old tomorrow, and has to mate with his Fated Partner before that, or is fated to die…? This “mating” actually means having sex? “A 99-year-old virgin and me!?” Is a great love story set to unfold in an isekai!? An isekai BL!