City Hunter is a notorious contractor group with the call sign XYZ. No matter the job, they will take it, cleaning up the scum on the streets of Tokyo. The key member of City Hunter is Ryou Saeba; armed with his trusty Colt Python and pinpoint accuracy, he works alongside willful tomboy Kaori Makimura. Together they solve tough cases and tackle the numerous dangers that accompany their trade head-on. However, when he's not out hunting crooks and villains, Ryou finds pleasure in chasing beautiful ladies with only Kaori and her one hundred-ton hammer to keep him in check. From pickpockets and arms dealers to crime syndicates, nothing can stand in the way of Ryou Saeba when he takes aim at his next mission.

Possessing a deep knowledge of mineralogy, Richard Ranashinha de Vulpian is a young and handsome British jewelry appraiser who owns a small shop in Japan. One fateful night, Seigi Nakata, a righteous college student, saves him from drunks who were harassing him due to his good looks. Upon learning of Richard's identity, Seigi hires him to appraise a pink sapphire ring that was left behind by his deceased grandmother. Before long, Seigi becomes a trusted part-timer at Richard's shop. Together, the duo solve various jewel-related requests from diverse clients of different backgrounds. Step by step, they unravel the hidden motives and feelings that lie within the gems in order to understand and empathize with the little stories behind each piece of jewelry.

After graduating from high school, Mai Kawai's top priority was to find a job with a stable income to avoid turning out like her father. However, despite having taken a variety of civil service exams, she was faced with a harsh reality: nearly every institute denied her entry. The only place that accepted her was a police academy, which she reluctantly joined. Even now that she is an actual police officer, the world continues to be cruel to Mai. Due to her profession, she unexpectedly receives constant criticism from disgruntled citizens. Disheartened by the hostile treatment, she decides to submit a letter of resignation after just a few months of employment. But on the same day Mai chooses to quit, she meets Seiko Fuji—the former ace of the Criminal Affairs Division who is assigned as her new instructor. Finding her new coworker to be enchanting, Mai delays leaving and gives her uninspiring job a second chance.

Miss Monochrome is an android powered by a single AA battery. She lives with her only friend, a robot vacuum named Ruu-chan. With hopes of one day meeting the idol Kikuko, whom she has bizarre recurring dreams about, Miss Monochrome sets foot on the path to stardom. However, she experiences difficulties and struggles to make her own debut as an idol. Though Miss Monochrome's methods seem bizarre, such as recruiting her manager from a convenience store, somehow her dedication always results in her standing out from the crowd and shining in the spotlight.