"Bukkake!!" is a manga series that blends elements of comedy, sports, and slice-of-life genres. The narrative centers around a group of high school students who form an unlikely team to compete in the unconventional sport of bukkake, a fictionalized version of water polo with exaggerated and humorous twists. The protagonist, Haruto, is a reserved and academically focused student who is reluctantly drawn into the world of bukkake after being persuaded by his energetic and eccentric classmate, Riku. Riku, the team's captain, is driven by a passion for the sport and a desire to prove its legitimacy, despite its niche and often misunderstood nature.

The team consists of a diverse cast of characters, each bringing unique skills and personalities to the group. Aya, the only female member, is a skilled athlete with a competitive streak, while Taro provides comic relief as the clumsy yet determined underdog. The group faces numerous challenges, including skepticism from their peers, a lack of resources, and the need to master the sport's peculiar rules and techniques. As they train and compete, the team forms strong bonds, overcoming personal insecurities and societal pressures.

The plot progresses through a series of matches and tournaments, highlighting the team's growth and camaraderie. Alongside the sports-centric narrative, the manga explores themes of friendship, perseverance, and the pursuit of passion in the face of adversity. The humor often arises from the absurdity of the sport itself and the characters' interactions, creating a lighthearted yet engaging tone. While the series maintains a focus on the team's journey, it also delves into individual character arcs, providing depth and relatability to the ensemble cast. The manga balances its comedic elements with moments of genuine emotion, offering a well-rounded and entertaining story.