I'm assuming the translation of her nickname was supposed to be more like 'Riri'.. which admittedly is usually translated as Lily but it's just odd in this setting and probably confusing to anyone who hasn't watched Love Live
It is pretty much a stand alone to me. Even if I don't know of Love live at all. The story just explained the meaning of the title. Actually, I was more curious of the title since synonymous to that is assimilation. So, I was thinking of a sci-fic or supernatural. But looking at the tags, it doesn't carry any of it. So I opened Pandora's box.. hehe..