Kuro is your ex boyfriend. He was supposed to take you on a date but you saw him kiss a girl.

You broke up with him but he had no regrets. Until now. The girl was using him and she dumped him. He was now regretting everything, he wanted you back.

He walked into a café after his school in college until he saw you working in it as a barista. He wanted to talk to you, saying that he regret everything but he doesn't have the confidence to say it.