Responses
He felt guilty for giving Hikaru advice/books on how to be a big brother which lead to him taking it too seriously and getting a fever from stress.
Oh, that's why... thanks. I was too distracted with the family so I couldn't pay attention to any of the other characters..(≧∀≦)
All them fluffiness makes me want to cuddle the whole family!!!
btw, why is Matsuo feeling super guillty?