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[Quick time travel small world style + double male protagonists (double black Taichung) Dazai Osamu & Nakahara Chuuya + no OOC (as much as possible) + appearance of other characters from different works + main character Nakahara Chuuya's perspective] [Holding a script, a bug-like existence that is hard to see through & an explosive player with a ceiling of combat power, a primary school student quarreling, extremely focused on his opponent's partner. "Small World" is an infinite flow of pass-through plot. If you haven't read Wen Ye's Baby, it will not affect your reading. Welcome to the double black pit~] During the brief and comfortable time when Hong Kong and Butei lived in peace, Nakahara Chuuya and Dazai Osamu received an invitation and were taken to an alien space by a mysterious force, where they met a girl who claimed to be a god. The girl takes Mori Ogai and Fukuzawa Yukichi as hostages, and Yokohama's security as a threat, and asks Shuanghei to play a game with her. What is the girl's purpose? What exactly is waiting for double black? Can they return to Yokohama successfully? [The world serves the plot, plot > level] One World, Two Worlds, Alien Invasion, Akira Naruhito, and Hondo Town Koharu make a friendly appearance. The regrets of the first world are made up for - Akutagawa, the regrets of the second world are made up for - Odasaku, Asukai Muki. Completed In the Three Worlds, Black Butler Ciel Phantomhive and Sebastian make a friendly appearance. Making up for regrets——Flag Club [Completed] In the four worlds, the problem children all come from another world. Back to Izayoi, the Seraph of the End, Hyakuya Michael, makes a friendly appearance. Making up for regrets——Miga and Chuuya [Completed] In the five worlds, Genshin Impact characters make friendly appearances [Completed] The Sixth World, the Storm of Juen, and the Friendly Appearance of Fuwa Aika [Completed]