At some point around this time, Hiroshi (大志) begins a solo project through Planet CHILD Music.
Although his stage name is Rossy (ろっしー), his releases say "Hiroshi (大志)" on the album art up until 2020. On streaming platforms "Rossy" is still used as the artist name, and many song titles make reference to that the name as well (e.g. "Love Rossy (らぶろっしー)").
By this point, Rossy (ろっしー) leaves Planet CHILD Music and becomes independent. He also seems to stop crediting his releases as Hiroshi (大志) by this point.
-other
Rossy (ろっしー) is an active visual kei solo project. They are part of the kirakira kei subgenre. They have been active since 2017.