The tag rakkogawa_rinro is an accidental amalgamation of two artists.
https://www.pixiv.net/en/users/57143023 - rakkogawa
https://www.pixiv.net/en/users/110251 - rinrokyuso

Both of their bios read: "Two people are engaged in creative activities in a circle called [Amayadoriya]." and link to the other and their mutual fanbox: https://amayadoriya.fanbox.cc/

This tends to appear a lot in Japanese collaboration artworks. You just tag the "circle" as well as the individual artists involved (not all artists in the circle are necessarily involved).

thegreatwolfgang said:
This tends to appear a lot in Japanese collaboration artworks. You just tag the "circle" as well as the individual artists involved (not all artists in the circle are necessarily involved).

That's about what I thought I needed to do, I guess I'll do it when I have upload slots to populate them with