Dungeon Master Madarame: Futsuu ni Yatte mo Muri Sou dakara Casino Tsukurukoto ni Shita

Suddenly appearing in another world is Takashi Madarame—a solitary, genius gambler. No sooner has he arrived than he is saddled with a daunting challenge: to amass 10 billion Dungeon Points while managing a dungeon of his own creation. Standing in his way is a litany of absurd rules; yet, for a mind honed in the cutthroat world of high-stakes gambling, outmaneuvering the system is mere child's play. Together with his hardworking partner, Kerama, he constructs... the most unorthodox of dungeons—a lavish, dazzling casino dungeon designed not to kill its visitors, but to ensnare them in its depths! "Come, then—come and play to your heart's content in my dungeon: 'Paradise'!" From slot machines to hot springs and even a gourmet buffet... surely you’ve never seen a dungeon quite like this!? The curtain rises on a dungeon-management survival saga, starring an unconventional gambler out to rake in the chips!

(Source: TO BOOKS, translated)