in this world, their is no heroes, no villains. only duelists. but some duelists work with dark forces that could end the world. that's why schools sprung up to teach young duelists to they could fend of these dark duelists. izuku always wanted to be like allmight. the number one duelist in japan. but his dueling skill was subpar but not terrible. he also doesn't have many cards. only enough for one 40 card deck. but bakugo ripped up his cards so he could no longer complete his dream. it just so happened that three legendary duelists found him crying next to his torn cards and offered to teach him and help him grow as a duelist.