Also how very emotionally needy and easily lonely Yuni can get. I imagine part of why Yuni fell so hard for Fuuko is because Fuuko turned Yuni into Fuuko’s whole world. That obsessive attention basically filled the emotional hole Yuni needs to be filled. Even with Nanase forgiving Yuni and being more attentive to Yuni now, that’s still not enough for Yuni because Nanase still has her own passions separate from Yuni (which is reasonable and justified) but for Yuni that appears to be just not enough for her.