Special episode included in the Blu-ray Box of Ano Natsu de Matteru.

In a futuristic, post-disaster Tokyo, the Special Public Security Fifth Division Third Mobile Assault Eighth Unit, or Unit Eight, is a police unit specializing in handling criminals who wield dangerous wearable technology called Willwear. Equipped with Willwear of their own, the squadron is often criticized by the public for their carelessness and disregard for protocol. Sent in by the government as an undercover agent with special instructions from the higher-ups, Asami Kazari is Unit Eight's newest member. Determined to straighten out what she expects to be a group of incompetent fools, she instead finds a team of well-intentioned experts who use very effective—albeit unorthodox—methods, hindered by strict regulations. With their newest member by their side, Unit Eight fights crime and overcomes unexpected adversaries in Active Raid: Kidou Kyoushuushitsu Dai Hachi Gakari.

Energetic and cheerful, 14-year-old Masaki Hinaoka takes his pet corgi on morning runs along the beach bathed in the rising sun. Suddenly, Masaki's eyes sparkle in awe: a blond boy surfs, delicate and breathtaking, with a slight smile gracing his kind face. Before long, Masaki encounters him again as a new classmate named Shou Akitsuki. Shou is a skilled surfer and has been immersed in the sport since childhood. Even though surfing is the hobby of choice for Masaki's best friend, easygoing half-Hawaiian Nalu Tanaka, Masaki has never shown interest in trying it himself. But his admiration for Shou's surfing style finally inspires him to try the waves for the first time—despite not knowing how to swim. On the surfboard, Masaki shows surprising potential and talent for balance. He learns quickly and eventually enters a local competition, all with Shou and Tanaka by his side. However, behind Shou's gentle smile lurks a darker shadow, threatening to overwhelm his friends. Nonetheless, Masaki fearlessly steps into the fun world of surfing, stopping at nothing to be the very best.

Defense attorney Ryuuichi Naruhodou is still hard at work defending the falsely accused with his knack for last-minute turnabouts. With his trusty assistant and medium-in-training Mayoi Ayasato in tow, Ryuuichi's fame as a champion for the innocent steadily grows. But this newfound success attracts the attention of the coffee-loving, masked Godot⁠—a mysterious rookie prosecutor who bears an inexplicable grudge against Ryuuichi. With the help of their allies, Ryuuichi and Mayoi take this new challenger head-on and search for the reason behind his appearance. But before long, the first two cases from the career of Mayoi's late sister Chihiro Ayasato become critical to solving a fantastical murder mystery, continuing the bloody saga of the tumultuous Ayasato clan. Will Ryuuichi once again be able to overcome the odds and find the truths hidden within the web of lies?