Mo Chen transmigrated to a crossover anime world where the real and the real worlds merge. Here, familiar characters like Shiina Chizuru, Hoshizuki Kaede, Hoshizuki Rin, Kitagawa Kaimu, and Ayachi Nene... have become his classmates. He also has two troublesome younger sisters: one is Kasugano Sora, a homebody whose isolation is worrying; the other is Suo Yuki, whose excessive closeness and clinginess are even more concerning. As the summer vacation before his senior year of high school was about to end, Mo Chen was bound to the Underworld Pure Deer Man System. [Task: "Chizuru's Secret Part-Time Job"][Task: "Shiina Chizuru's Study Diary"][Task: "Three Thousand Times Sensitivity Training for the Demon Ninja Yukikaze"] "?" Staring at these appalling task titles, Mo Chen felt that this was something an ordinary person like him couldn't possibly complete. But when he saw the new hypnosis app on his phone, his gaze shifted to his cute younger sister, "Yuki, come here for a second, let me test you."