I'm the Hero, but the Demon Lord's Also Me manga volume 3 features by Akiyoshi Ota and art by Tatsuya Endo.

Life at Tsugari Bathhouse, a small public bath in Shitamachi, has finally returned to normal—or so Yuuma thought! Naturally, strange visitors from another world are invading! How will Yuuma react upon meeting our new heroines—a gentle, holy dragon girl with a bottomless pit for a stomach, and a demonic dragon girl who’s a somewhat good person!