A to ZA to Z, 赤焰之鏈; A to Z, 赤焰之链; от А до Я; エー トゥ ゼット

Undercover investigator Matsuzawa Tomoya has a blood-stained past and hidden abilities. His new suspect, Kiryuu Yuuki, is one who looks exactly the same as the bloody man who has been in Matsuzawa Tomoya's mind for the past 15 years.