A shy, quiet and hard-working man, Japan doesn't know very much about the outside world and needs time to adjust to other people. But he's very curious and interested in learning things from other nations. His distinct island customs may seem mysterious to others, although he finds them perfectly normal. Though he appears to be horrified at the idea of nudity or intimate contact, which he tries to hide secretly between his non-erotic books and was said to be very comfortable with nudity in the past.