During the first year of UA High, Y/n and Shoto fell in love. However, Endeavour, Shoto's father, didn't approve. He said that Y/n's flames quirk isn't compatible with Shoto's half-cold half-hot, and that any potential offspring wouldn't have the best potential quirk coming from Shoto. Years later, Shoto is working as an intern at Endeavour's agency while y/n works at Hawks agency. One day, they are brought together again for a joint mission. The mission forces Shoto and y/n to work together and synchronise, bringing back old memories thought to be left behind in the past.