1925. Summer. Katsuki Bakugo is the heir to a large fortune, and he lives on UA Island, a place that some of the world's most wealthy people live. It's a place of lavish parties, spoiled heirs, broken homes and big mansions. Bakugo hasn't always lived there, though, and his family wasn't always wealthy. When his childhood friend, Izuku Midoriya, appears on the island, suddenly extremely wealthy with no hint as to how he'd gotten his money, Bakugo starts trying to figure out the mystery. Meanwhile, Midoriya struggles to fit in on the island, Ochako Uraraka is willing to sacrifice her happiness for her family, Shoto Todoroki wrestles with his troubled past, and Eijiro Kirishima is trying to make the impossible choice between love and duty.
Kireina Yamada was merely 5 years old, a child when her life got turned upside down. Kicked out of her home and left to fend for herself on the streets until a young man found her and took her in, then a mysterious person sends her a letter later in her teen years. An invitation to UA High from the principal himself. She decides to go just for the fun of it. Maybe she can find her brother or her father whom she knew nothing about. Maybe someone there can show her the love she never got to see in action as a child. And maybe it's more than one person.