Song by Nayutalien, with vocals by Nanawo Akari and featuring Sou. It was used as the ending theme to the animated adaptation of Rikei ga Koi ni Ochita no de Shoumeishitemita.
The song features two official music videos: one live action with Azukin Toki and choreographer Iriban-sensei dancing, and the other with animated characters designed by Terada Tera (as with other Nayutailien / Nanawo Akari collaboriations). Those characters can be seen in post #4814546.
The latter video spun off a number of virtual Youtuber, who all use the animated MV as inspiration for the cover videos.
There's also an TV anime version song MV like all other anime EDs, but it's much less known and referenced.