So.. does Ogata like Niimura? It doesn't look that way to me.
But if that's the case, then it's a looping triangle, indeed.
She definitely does. Ogata only blushed when talking to Niimura, even when talking to Shiratori right before, she gave an answer like "uh huh" while acting a bit disinterested, but when it came to Niimura, she was all ears and smiling. She was likely a bit cold to Shiratori because she was always with Niimura.
This is the kind of love triangle I like, where everyone suffers together, equally. When someone is left out, then I dislike it. Threesomes are also okay since everyone is happy together, equally.