Damn, it's angsty af but also wholesome. But, yeah, I got quite hurt over the love triangle in the beginning.
First couple are alpha & omega. Fated pairs. There were some troubles at first but everything went well.
Second couple are two butlers. Alpha & beta. The beta had a huge thing for his master(aka the omega in the first pairing) & endures it all with a smile. He has a lot of insecurity & thankfully, the alpha was patient & understanding. This part was truly an angst ride but all's well that ends well. The ending was too damn wholesome & sweet.
Third couple only show up vaguely for a bit. They aren't explicitly stated.
Kashikomarimashita, Destiny