Noragami: Hiyori x Yato
Definitely one of the sweetest couples in shonen anime/manga even though it also has the potential to be one of the most tragic given the whole dilemma of Yato being an immortal God and Hiyori being a mortal. Hopefully, they can work through that. And Yukine makes this pairing more endearing since they tend to treat him like he's their son, and the three of them do make a good family unit.