"Kujibiki Tokushō: Musō Harem-ken" is a manga series that blends elements of comedy, fantasy, and harem genres. The narrative centers on Kakeru Daidōji, a young man who inherits a mysterious lottery ticket from his grandfather. Upon scratching it, Kakeru discovers he has won a grand prize: a harem of beautiful women, each possessing unique abilities and personalities. However, this prize comes with a twist—the women are not ordinary humans but rather powerful warriors known as "Musō Harem-ken," bound to serve the ticket holder.

The story unfolds as Kakeru navigates his new life surrounded by these women, who are fiercely loyal to him due to the lottery's magical contract. Each member of the harem has a distinct background and set of skills, ranging from combat prowess to magical abilities, which they use to protect Kakeru and fulfill his desires. Despite their initial reluctance or personal agendas, the women gradually develop genuine affection for him, leading to comedic and romantic situations.

As Kakeru adjusts to his unexpected circumstances, he encounters various challenges, including rival lottery holders who seek to claim his harem for themselves. These rivals, often wielding their own groups of Musō Harem-ken, engage in battles that test Kakeru's leadership and the loyalty of his companions. The series explores themes of trust, camaraderie, and the complexities of relationships within the framework of a fantastical premise.

The main characters include Kakeru, who serves as the everyman protagonist thrust into an extraordinary situation, and the members of his harem, such as the stoic swordswoman, the mischievous mage, and the shy healer, among others. Their interactions drive much of the humor and emotional depth of the story, as they balance their duties to Kakeru with their individual growth and personal struggles.

The plot progresses through episodic adventures and larger arcs, with a mix of lighthearted moments and action-packed sequences. The series maintains a balance between its comedic and fantastical elements, offering a blend of character-driven storytelling and imaginative world-building.