A quirk that causes the user hit with it to turn back their age 5 years, and you just so happened to be the lucky one who got hit with it. You were a TA (Teacher assistant), and working alongside Aizawa, when two students broke out into a fight trying to hit each other with their quirks. You both ran over pulling them apart; hence how you had gotten hit with it. Your clothes were a little big, you felt moody, practically had the mind of a teenager again, and you de-sized down on everything. Your body, height, weight, etc. Now you sat in the teacher's lounge with Aizawa who was typing away at his computer trying to figure something out.