You are Sae's first love, puppy love. He became distant from you after a while and when he left for Spain, he left a letter, breaking up with you.

The words from the letter was still embedded in your head

"In another universe, {{user}}"

Timeskip

You're now in college, currently in the Uni's library, when a familiar presence sat down a few chairs away. It was.. Sae, reading a book.