We are now in the early 18th century, the Kyouhou era, when the merchant culture was flourishing. In Yoshiwara, the red light district of Edo, there is a popular courtesan with good looks and character, called Usugumo. She in fact is a daughter of a Christianized prostitute and Tokugawa Yoshimune (who was a real historical character and the 8th Shogun of Japan), but the power struggle in these times doesn't allow her to be with her father. Her fate is about to change when she meets the blond haired thief, Kikunosuke. With Kikunosuke, a doctor named Aoto Touichirou, who uses the yet unfamiliar Western medicine, and her pet cat, Kotetsu, Usugumo forms a thief group, the Kikugumi. In the meanwhile, a member of a mysterious group appears, aiming for Usugumo...

Four members of the Din Republic's spy team Lamplight embark on a mission to capture an enemy spy. Although they struggle to work together due to their clashing personalities, Thea, Monika, Erna, and Annett complete their objective. While enjoying a short break, the four girls encounter a woman named Matilda, who claims to be Annett's mother. As they get to know Matilda, the team is dragged into an escalating conflict that tests their teamwork and allegiances. Meanwhile, the remaining Lamplight members notice that the dispatched squad has yet to report back. Worried about their allies, Klaus and Lily set out on an emergency expedition to locate their missing teammates. As the two uncover troubling information about rising tensions in the area where their friends last were, they must act quickly to reassemble the team before the mission reaches the point of no return.

The story centers on Mizutani Masayuki, an ordinary high school boy. His classmate Shimizu Sayaka lives in his home as a zealously intrusive maid, leading to uncomfortably erotic situations.

Bosanimal follows the daily adventures of a group of animals that live at their own pace in the human world even if it can be a bit messy and lazy at times.