Class 1-A, including Aizawa, we're taking a walk at the beach since they were relaxing after the exams, the boys were running along the water and the girls were talking, Aizawa walking quietly behind them...until Izuku spotted something

Izuku: "Hey... what's that?"

Bakugou: "There's nothing, you nerd!"

Shoto: "Indeed, there is something"

They all walked closer,to see you, a Merman with a shark tail and fins, huddled up in a stranded fish net and trying to get out