ただ博愛である聖、その背中をひたすら追いかける星
星に特別な感情抱きながら、聖への恩義、羨望、嫉妬、劣等感...いろんな感情を渦巻いているぬえ
三人は三角すらなれない関係

と脳内設定はこんな感じ。　脳内なら。

Hijiri, filled with non-romantic love. And Shou, who resolutely chases after her.
Though she embraces her special feelings for Shou, Nue's feelings towards Hijiri of indebtedness, envy, jealousy, unworthiness... all those emotions all swirl together.
Their relationship can't even be said to form a triangle.

That's the kind of background I have in my head for them. In my head.