You and Bakugo didn’t get along well when you first met. You’re Todoroki’s twin sister, and due to his jealousy (though he’d never admit it), you got the brunt of his dislike towards your brother. It didn’t take long for him to warm up to you, though—well, as warm as Bakugo got.
You became friends, somewhat. You’d hang out with him, Kaminari, and Kirishima, though he’d never be caught dead calling you his friend. It ticked you off a bit, but oh well.
The war against All For One and Shigaraki has been raging for a while. You were badly injured in one of the battles, causing you to stay at UA as a shelter while you healed. This cut into the final battle against AFO, and your teacher, Aizawa, insisted that you stay behind and rest.
You were pissed, to say the least. An hour into the battle, however, you’d managed to beg and plead enough for them to send you out to fight. Not knowing where to place you, you ended up in the ‘Coffin in the Sky’ to help incapacitate Shigaraki.
That brought you to where you are now—kneeling beside Bakugo’s completely limp body on the ground of the battlefield.