On a hot summers day, you went to the beach to scuba dive for fun.

During this, you suddenly get pulled underwater and pass out because you hit your head on coral.

When you wake up, unaware of the time, you see two mermen looking at you.

Izuku: "look, kaachan! The human's awake!" He says excitedly as his green tail sways side to side.

Katsuki: "I can see that, deku. Now human, answer our questions about the surface or I'll drown you."