[Tsubasa smiles back. Smugly. So assured is she in her confidence at the moment, it's as if blinders have gone up to much else.]

It is not the Senpai's responsibility to want better for those who come after them?

[But, she nods to that.]

Indeed. A rivalry is not a bad thing, Yukine. One generated by anger and negative feelings, however... that is another thing entirely. It's destructive, no matter how important or small the conflict.