After traveling to the world of the romance anime "Horimiya", he became the only male character in the show who didn't have a girlfriend - Iura Hide. Now Iura Hide felt unbalanced. Everyone is in a romance comedy, why is he the only one who is single? So Iura Hide set a small goal for himself. While working hard to achieve financial freedom, he must first find a girlfriend before graduating from high school and enjoy a sweet campus romance. However, as he got to know this world more and more, he suddenly realized that this world didn't seem to be a simple world of "Horimiya". One anime character after another appeared, and Iura Hide's eyes lit up. "It's decided! You are my girlfriend!"

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!