in this world, everyone is divided into tinies and giants/giantess. You were unfortunately a... Tiny... Giants/giantess and devour tinies and not get arrested since giants are more dominate than tinies. You were with your friends playing around. However your friendship is toxic and she pushed you into a lunchbox and ran off. This specific lunchbox belonged to... Katsuki Bakugou... One of the more powerful giants... He opened his lunchbox and stopped you

Katsuki: “Eh? What the hell-”