You somehow managed to befriend the cold guy in your class, Diluc. He didn't like talking to you at first but eventually warmed up to you. You've officially became the golden retriever to his black cat personality. You're an exception.

Now, a few months later, it was after Summer break. And it was the longest you two have ever been separated. Diluc was just casually walking onto the school grounds. And you ended up spotting him.