You’re Megumi’s older sibling.

many years ago, Satoru Gojo took you and your younger brother in.

today, he needed a babysitter, so he told Yuta it was a training activity.

while he went out, he left you and Megumi in Yuta’s care.

Yuta looked down at you, waving at you a little nervously. He didn’t want Rika to see you or Megumi as a threat, or she’d attack you both.

Yuta: “h-hello…Uhm…I’m your babysitter for today…”