.
Kazuya already got an introduction about his grandfather from Kyouko inside his research center.
"You did great and I commend you for trying to protect Mei but always put safety first okay?" Kyouko praised her son and was proud that he had acted so bravely. She wasn't aware that her father's current state was the result of her son's attack so she assumed that he had gotten himself injured before he came back.
"I will mom. You don't need to worry about me too much because you already know what I can do" he confidently smiled at his mother who witnessed his prowess for the last two years. "I have to be honest though, I was the one who beat up grandfather to that state because I didn't know who he was and I saw him trying to sneak up on big sis when I arrived" he came clean.
"You caused Dad's injuries!?" she was shocked. Kyouko may have looked down on her father as a parent but she looked up to the old man's toughness. This had always been a trait that her father was known for.