"Knights of Ramune & 40" is a science fiction anime series set in a futuristic universe where humanity has expanded into space. The story revolves around Cacao, a young boy who discovers a mysterious spaceship called the Ramune. This ship is powered by a unique energy source known as "Ramune," which grants it extraordinary capabilities. Cacao becomes the pilot of the Ramune, embarking on a journey to protect the galaxy from the malevolent forces of the Dark Joker Army, a group seeking to dominate the universe.

The Dark Joker Army is led by the enigmatic and ruthless Emperor Zeros, who commands an army of robotic soldiers and monstrous creatures. Cacao is joined by a diverse group of allies, including his childhood friend, Princess Romina, and a skilled warrior named Nova. Together, they form the Knights of Ramune, a team dedicated to thwarting the Dark Joker Army's plans and restoring peace to the galaxy.

Throughout the series, the Knights of Ramune face numerous challenges, including battles against powerful enemies, internal conflicts, and the moral dilemmas of war. The narrative explores themes of friendship, loyalty, and the struggle between good and evil. As the story progresses, Cacao and his companions uncover the true nature of the Ramune energy and its connection to the fate of the universe.

The series is structured around episodic adventures, with each episode presenting a new threat or mission for the Knights of Ramune. However, an overarching plotline ties these episodes together, culminating in a climactic confrontation with Emperor Zeros and the Dark Joker Army. The characters' growth and development are central to the narrative, as they learn to work together and harness the power of the Ramune to achieve their goals.

"Knights of Ramune & 40" combines action, adventure, and science fiction elements, creating a dynamic and engaging storyline. The series is notable for its imaginative world-building, intricate plot, and memorable characters, making it a distinctive entry in the genre.