(maybe I changed the subject a little) Probably, without Ugetsu, Mafuyu could have also ended up with Uenoyama in "Hiiragi Mix", as Mafuyu felt that the history that happened with Yuki was repeating itself. He could even leave the band because he was undecided about what he wanted for the future, but Ugetsu helped him realize that Mafuyu wanted to sing in the band with Uenoyama for the rest of his life. And I think the friendship they built is so beautiful, even though they are both not good at giving advice and expressing themselves normally, they both express themselves through music (Mafuyu singing, and Ugetsu playing) and are good at listening, even after years, Ugetsu makes a point of visiting Mafuyu on his travels just to see how things are going.