A gyaru and the main female protagonist of the series, who becomes Jirō's partner during the couples training. While Akari portrays an extroverted and confident nature, deep down she is actually very sweet, shy and kind towards her friends and loved ones. Her goal is to become the partner of Minami in the training, and she will do anything, even act like a well-behaved newlywed with Jirō. However, as the story progresses she loses her crush on Minami and falls in love with Jirō for real. Now, her new goal is to become an actual couple with Jirō but struggles to put her feelings into clarity, as well as dealing with Jiro's own insecurities. (Source: Wikipedia)

Also known as Black Cat and the main protagonist in the story, he starts as a ruthless assassin but learns compassion from Saya Minatsuki. He always wears a bell around his neck to remind him of what he once was and could once more become. In the manga, he already has the bell from book one. In the anime, Eve gives him the bell from the fable of the Black Cat. His gun was made just for him by Chronos, called Hades. He also has a soft spot for women and children, especially when tears are shed.