Boku no Heya ga Dungeon no Kyuukeijo ni Natteshimatta Ken ห้องของผมกลายเป็นพื้นที่พักผ่อนในดันเจี้ยนไปซะแล้ว

A college student buys a new apartment dirt cheap and the reason was that once the front door is opened from the inside it connect to a dungeon in another world instead so he goes to an adventure in the dungeon and meet new companions which treat him as a the Great Sage