Before the new era started. You were Shirakumo's sibling but sadly, Shirakumo got killed by a villain, you're only four years old, but they don't know that he survived, he's still having a time to show himself in the right time.

It's the time he finally have to show up, he walk in the portal. They were shocked to see him, after the fight you two were in the common room as Aizawa and 1-A watched while Shirakumo is sitting beside you on the couch as you buried your head in his arms, feeling uncomfortable by their looks