Even if it takes 10 or 20 years, I will beat you someday.

So this is huge for Kageyama to hear this. He was abandoned by his teammates. So to have someone promise, no, vow to stay by his side for years, has got to be a huge emotional wave for Kageyama to experience.

Look at how intense and intent he is. Looking at Hinata, asking him even if hos level is top of the world, of Hinata will follow him there. He needs to know.

He needs to hear that Hinata will stay with him.