And So, Ayatsuji Yukito Became Natsume Soseki’s Disciple

There's transmigration, fantasy, mystery, and more. The author hasn't read the side-story novels, but became a fan through the manga, so characters may be out of character. Transmigration does not come with Kyogoku, but does come with Misaki. All pairings. Synopsis: During a case, Ayatsuji Yukito accidentally transmigrates into the past through his ability. He discovers that the "Three-Part Framework" is still only a plan. At last free from the Special Division's surveillance, and unfamiliar with the place, he finds himself caught between Mori Ougai in front of him and Fukuzawa Yukichi behind him, both threatening him with their blades. So he turns his attention to the calico cat pretending to be innocent nearby. "I know your teacher, and he told me about you and the Three-Part Framework. As it happens, he's here himself. I have something to discuss with him." Natsume Soseki: I didn't, I don't know you, and how would you know that? "I know you're very interested in my mind. You can assign me wherever you like, whether it's the Armed Detective Agency or the Port Mafia. I'm pretty bored either way." "The first thing we should deal with is the Port Mafia. You originally planned to have Mori Ougai handle it, but it seems you've come up with a new idea. Let's hear it." Natsume Soseki: "...Would you be willing to become my third disciple?" Theme: Ayatsuji from the side story has come to stir things up in the main story!