This author has not been identified. Look up 'Osanori Koyama' in GoogleThis author has not been identified. Look up 'Ryou Sougen' in GoogleThis author has not been identified. Look up 'Keisuke Ikushima' in GoogleThis author has not been identified. Look up 'Makoto Yamada' in GoogleThis author has not been identified. Look up 'Yutaka Katsuyama' in Google