Fuck it, Migo collection post.
A while ago NijisanjiEN announced they would release a duet song every month under the moniker "NIJI ENcounter". No covers either, but full fledged original songs. This went somewhat under the radar as most things seem to go with NijiEN these days, even though I think it's quite a nice initiative. There doesn't seem to be a pre-announced schedule for who gets a song and when. It's basically: Song gets announced -> release after one month -> next song is announced.
After about 3 Months that means that 2 Songs got released and the third was just announced.
Sonny x Shu
Ren x Doppio
And finally a woman song with Petra x Reimu, out in exactly one month