A large scale catastrophe is occurring across the planet. Ability users are discovered after the appearance of a mysterious fog, apparently having committed suicide, so the Armed Detective Agency sets out to investigate these mysterious deaths. The case seems to involve an unknown ability user referred to as "Collector," a man who could be the mastermind behind the incident.

Trust and courage are put to the test in order to save the city of Yokohama and ability users across the world from the grip of Collector where the Armed Detective Agency forms an unlikely partnership with the dangerous Port Mafia.

Although traumatized by witnessing the murder of his parents by one of the Choushuu, Ichimura Tetsunosuke's thirst for revenge leads him to desire strength. At the age of 15, Tetsunosuke approached the Shinsengumi, wanting to become one of its members. However, Tetsunosuke lacked the skill, mind, and will to emotionlessly cut down whoever threatened peace and the Shinsengumi. Even with the support of his brother Tatsunosuke and his newfound friends of the Shinsengumi, little did Tetsunosuke know the blood and pain he would have to face being part of this historical group.

Even when you're fortunate enough to live in a place as beautiful as the country village of Asahigaoka, you should never turn down the chance to explore someplace else. So, when Suguru wins a free trip to Okinawa just as the summer vacation is coming to an end, the town's entire school… all 5 students and 1 teacher, plus the local candy shop owner… can hardly wait for their 3-day trip to begin! Between kayaking, swimming and meeting new people, there's always something fun happening, but the best part of all is that big city girl Hotaru and her new small-town friends all get to explore the wonders of Japan's famous vacation destination together. Prepare for the perfect trip as the whole gang boards the plane!