Boku no Heya ga Dungeon no Kyuukeijo ni Natteshimatta Ken: Houkago no Isekai Boukenbu

Following the sudden disappearance of his parents, Tooru Suzuki’s life spiraled into disarray, ultimately leading him to take up an unlikely role as the caretaker of a dilapidated school dormitory in Tachikawa. The building is falling apart, its student residents are a collection of eccentrics, and persistent rumors suggest the halls are haunted. However, the truth behind the dormitory is far stranger than any ghost story: the structure conceals a gateway directly connected to another world. Though Tooru remains completely friendless among his classmates during regular school hours, he has found a remarkable escape. Whenever classes end, he ventures into the hidden dungeon to battle monsters and steadily increase his own strength. His solitary expeditions soon change when he forms unexpected alliances with the fantastical inhabitants of this new realm, befriending a slime, a female knight, and a female sorcerer. With a growing party of otherworldly companions by his side, Tooru transforms his lonely reality into an extraordinary routine, embarking on thrilling after-school adventures that blur the line between ordinary club activities and epic fantasy exploration.