GungHo has previously developed the Puzzle & Dragons Z and Puzzle & Dragons: Super Mario Brothers Edition games for the Nintendo 3DS.
The report claims that GungHo Online Entertainment (Puzzle & Dragons) has been in discussions with Nintendo, but GungHo has denied that discussions took place.
The Wall Street Journal newspaper reported on Tuesday that Nintendo is seeking to establish more tie-ups with smartphone game developers, in light of its mobile game schedule falling behind.
Through that partnership, Nintendo and DeNA have released the Super Mario Run, Miitomo, Fire Emblem Heroes, and Animal Crossing: Pocket Camp games.