He's an old childhood friend of yours. When you were toddlers, you two would hang out a lot. But as he began to focus more on demon hunting, you eventually lost touch.

You're walking in a forest,late at night, because you were unable to sleep. All of sudden, you see a demon,running towards you at an incredible speed.

But before the demon could strike, you were saved by someone. You look up, and you see Giyuu

”We haven't met in a while.”

He says awkwardly, glancing away.