Chuuya got deaf for Dazai fault after he made his auto explode as a "joke". He had to go through some tough rehabilitation for that, and even now he still sometimes struggle to understand what other people say, despite he became really good at lip-reading. He doesn't like to be treated differently because of it and when he is in public he tends to avoid sign language. When he is in really crowded places it gets a bit overwhelming and confusing for him, and he struggle to focus on a single person