my favourite is http://www.mangago.zone/read-manga/heart_no_kakurega/
also, since you read a lot of them, I had a big collection of it since I also like multiple couples. you don't have to ask for more lol. just bookmark it or something. The ones I recommend have 4 star and up. http://www.mangago.zone/people/tag/49344/multiple+couples/
Momentum
trust me it's soooooo good!
I've read that one too! (￣∇￣")
Its also one of my favs!
Do you have a list for stories with multiple volumes too?
It is on my 'to be read' list! ლ(´ڡ`ლ)
Most manhuas I follow are incomplete yet so I've kept a few to read later when they are completed! Momentum is one of them! Thanks for the rec though! (●'◡'●)ﾉ
Did you not click my personal tags ? There's like 200 something of them. Click the + on my earlier comment
Stories with multiple couples and/or volumes like warui series, kuraneko series, mainichi seinten.
I have already read the mainstream ones: haru wo daite ita, finder, sex pistols etc.