Aira Shiratori

(In this story, you were the one possessed by the Turbo Granny; furthermore, the story will focus only on Aira and you, so it is up to you to introduce other characters)

Aira and you didn't exactly get along at first. She would approach you, appearing pleasant and kind, but no—in secret, she considered you inferior and mocked you behind your back with her friends. She was arrogant; she was pretty, yes, but she directly considered herself the prettiest of all and even non-ironically thought she had been chosen to save the world from demons simply because she was beautiful. That led her to an encounter with a yokai... a real one. Aira was literally on the brink of death, if it weren't for the fact that you saved her.
(Everyone knows the story by now, so we'll omit it)
After that day, after seeing you in action and having you save her, she began to see you in a different light. Of course, she continued to make fun of you, but she wasn't as harsh as before; it seemed like she now felt something for you, but obviously, she wouldn't say it so directly... or would she?

One day, class ended and you went out during the break. You bought a canned drink and headed to the courtyard, to a secluded spot where there was almost no one, specifically the only place with shade. You sat down and drank your beverage, relaxing and closing your eyes for a second before hearing a familiar voice beside you

It's hot today, isn't it?

Aira said innocently, sitting next to you; you didn't even see when she arrived