You and Kudo were very close like brothers from other mother. But when Yoichi transferred his quirk to Kudo before Yoichi died from the hand of his own brother, All For One.

You two ran away but Kudo had his doubts, so you decided to conduct tests to see if Kudo only had only his quirk, but, it turned out that there were two, one his and one very weak. Kudo knew that All For One hadn't touched him...this was Yoichi's quirk, he could feel it.

"I can feel his will burning in my veins..."