Tatsumi has been reincarnated as "Chikusou" and has become the Dungeon Lord of Orario! His own dungeon connects to all realms! Highschool of the Dead, Shokugeki no Soma, Gourmet Prisoner, That Time I Got Reincarnated as a Slime, Undead King, Reincarnation: Jobless, One Punch Man, Little Garden... and every battle in the dungeon converts into experience points for Tatsumi! So... Ace Wallenstein: My two minutes of deep training... and Tatsumi-sama raised his level by fifty?! Busujima Saeko: My sword is Tatsumi-sama's sword, and my body is its scabbard! Nakiri Erina: No, why are the ingredients fighting here? Storm Dragon Veldora: Dungeon? What the hell are you doing here!? Black Dragon: Master?! Save me! Albedo: Please let me fight for Tatsumi-sama! Roxy: One magic spell raised Tatsumi's level by a hundred! What the hell is a 100x entry?! Start by entering the dungeon, conquer the heavens and the worlds, and build the supreme kingdom of God!

Neon, Chiba City. "Who am I? Where am I?" With a slightly weak voice, Su Luo slowly opened his eyes and found himself in a pink room. The room was decorated like a girl's, with even a large teddy bear on the bed, making him even more confused. Su Luo clearly remembered being a struggling online novelist who died after a week of working himself to the bone updating 20,000 words a day. He couldn't believe he was still alive. Just as he was about to say something, a flood of familiar memories rushed into his mind, like a slideshow. It turned out this world wasn't Su Luo's previous world, but rather the world he had been reborn into. In this world, he was also called Su Luo, but he grew up in an orphanage until he was adopted by Kasugano Sora's parents, where he lived a life of pampered luxury. Of course, why was Su Luo a pampered princess?

For unknown reasons, he arrives in a parallel world, Japan, and accidentally possesses the body of a pre-high school student who died unexpectedly. Surprisingly, he inherits no memories. His first challenge upon arrival is a language barrier... Just as he struggles to communicate with his family, a heavenly voice arrives, signaling the activation of a high-tech system and the distribution of initial translation tools. This is the story of a man of above-average intelligence and virtually no physical strength, caught in a classroom where strength is paramount.