Ryo-maro (りょーまろ) is the collab unit between two fellow utaite Ryo-kun and maro.. They have their first performance together in the event "Vomas 19". Thereafter,they have released two albums: "a.c.t" and "a.c.t 2 ~seasons~", as well as a collaboration album, "SPLASH" with the circle MUDEAN. In addition to holding namahousous together, they often hang out in real life, as seen on Twitter.
maro. became a professional singer in 2014 while Ryo-kun went forward one year later in a different project.