Interesting. I didn't think he'd bother to do this. If you think about his personality so far, he has quite disliked doing anything extra that would distract him from his studies. Although that being said, maybe he was only extremely dedicated to studies when he had the entrance exams coming up, but will be just normal during regular school days. Whatever the case, I suppose he's quite responsible, so if he realised Chie's regrets, he would go at least this far to do something about it. Not that he'd be guilty of anything, but they are nominally friends by association and history. A friend in need is a friend indeed.