It must have been something serious if it prevented you from attending school.

[That reminds Kotone of the time she first transferred to Gekkoukan High. She got sick and missed an entire week of school. It took a while before she was able to catch up, but it was still manageable. She wonders what happened to Akechi. ]

Are you interested in continuing? Or did you have something more important to take care of?

[It's an honest question. She won't press him for details if he's uncomfortable. ]