Misa's mother should in fact be worried. If Misa spends too much time in that 100% herbivore guy's company, her fighting prowess will drop and she won't do so well in martial arts anymore.
I just realize this after rereading it but damn, Japanese middle schoolers go to school at 6 AM and came back at 6 PM... I feel like a failure when I’m procrastinating about my life now...