I think we often forget that they are also other relationships we can have than just friendship and romantic relations. Just being connected to a very deep level without having to be sexually attracted to each other is also a very beautiful thing and this manga portraits it very nicely!
Like what? We have:
Parental
Fraternal
Romantic
Friendship and its derivates which funnily includes sexual relationships too
And honestly i cant even call their relation the typical "more than friends and less than lovers"
At this point theyre just BFF and with the way Yuriko is currently i dont see a future where theyre more than that xd
Asexuals and/or aromantic people sometimes get into whats called a queer platonic relationship, or qtp for short. It's somewhat between a friendship and a romantic relationship where sex or kissing doesn't neccisarliy have to happen, though It varies from individual to individual.
Pretty sure this is where the story is leaning towards.
