Kouun no Shokichi ga Ijou ni Takakatta Koukousei ga, Kanzume Gacha de Te ni Ireta Skill wo Tsukatte Gendai Dungeon de Saikyou ni Naru Monogatari

A world where dungeons have become familiar. A regular high school student, Taira Ichino, mutters while holding a can he got from the Osaka Umeda Dungeon, "If only I had my own dungeon..." and then the lid opens...?!