[Crossover] The New Double Black Keep Going Missing

On his first day working at the Armed Detective Agency, Nakajima Atsushi accidentally transmigrates to the post-apocalyptic world several years in the future. Years later, he is battered and wounded, but returns to where it all began. Not long afterward, he brings his partner along too, and the two begin a series of journeys back and forth through time. The apocalypse isn't a coincidence. Beneath a life that seems as calm as a lake, a treacherous undercurrent is surging. Even so, he has only one wish: "Akutagawa, I want us to live together, happily." This story centers on Atsushi and his love-triangle showdown with Yokohama's F4. Also known as: "The Adventures of a Certain Suicide Enthusiast Fighting His Former Student for His Current Disciple," "People Who Are Five Foot Three Shouldn't Date (Strikeout)," "Saving the World Takes a Black-and-White Duo," and "The Author Started Another New Story While Crazy Busy, and This Time They'll Definitely Finish It in Under a Hundred Chapters (Strikeout)." Reader's guide: 1. CP: AkuAtsu. There is a love-triangle showdown. 2. The blurb is a little playful, but the story itself is very serious, and there are heartbreaking scenes. Please bear with me. 3. Update schedule: New chapters Monday through Friday; weekends off. Updates are usually at 7 a.m. or 7 p.m. If an update is late or I'm taking a day off, I'll post a notice.