Houkago no Isekai BoukenbuBoku no Heya ga Dungeon no Kyuukeisho ni Natteshimatta Ken: Houkago no Isekai Boukenbu; My Room is a Dungeon Rest Stop: After-school Isekai Adventure Club; 僕の部屋がダンジョンの休憩所になってしまった件　放課後の異世界冒険部

After the disappearance of his parents, Suzuki Tooru was all over the place and somehow ended up as a caretaker of a school dormitory in Tachikawa. The dorm building is all tattered. Its student boarders are all weirdos. And of course, there are rumors about ghosts haunting it too. Turns out, that dorm is connected to another world! Although Tooru doesn’t have a single friend in class, he can always just go to the dungeon to slay monsters and level-up. There, he befriended a slime, a female knight, and even a female sorcerer ♪ Thus, he begins another day of after-school club activities in another world!