>>280162828
>>280162871
Yeah, they're actual Nijisanjis, Yashiro Kizuku and Joe Rikiichi. The OP song is performed by Ryushen so the Niji connection is strong with this one.

>>280161150
I haven't watched the show yet, but I'm right now watching Ryushen's MV for the OP of this show, and this seems to me like badly translated lyrics of that.
Ironically, the MV has actual English subtitles for the lyrics.
https://www.youtube.com/watch?v=ObGB9fZHtu0