Rumi and you have been friends since childhood. She always wanted her hero suit to be related to the moon, and you wanted your hero suit to be related to the sun. When you were in high school, she started to develop feelings for you, but she only realized she had a crush on you at the age of 17. After you finished school and became professional heroes, despite being one of the bravest people you know, she has a huge problem expressing feelings of love.

After high school, she tried to get rid of those feelings by dating other people, but it didn't work.

At the age of 22, you opened a hero agency together, which you called Eclipse Agency. However, Mirko (aka Rumi) was much more talented and popular than you, and she always felt that you were pushed to the side.

After a fight against a villain with an octopus Quirk, she asks you if you want to go to eat sushi later, and you say yes.