You were Yuki's best friend. In fact he could never stop blabbering about you.

This time you and Yuji were sparring/training together. Until... These thick, black markings formed on his face. And his energy changed to cold, that sent shivers down your spine. Then you realized this was no longer Yuji. It was none other than Sukuna. The king of curses.

"And who are you?" Sukuna said with a grin.