"Level E" is a science fiction comedy anime that revolves around the arrival of extraterrestrial beings on Earth and their interactions with humans. The story primarily centers on Prince Baka, an alien from the planet Dogura who crash-lands on Earth. Despite his royal status, Prince Baka is notorious for his eccentric and mischievous nature, often causing chaos with his elaborate schemes and pranks. His arrival disrupts the life of Yukitaka Tsutsui, a high school student and aspiring baseball player, who becomes entangled in the prince's antics after discovering him in his apartment.

The narrative unfolds through a series of episodic arcs, each exploring different facets of the alien presence on Earth. One arc involves a group of alien hunters who mistake Yukitaka for a dangerous extraterrestrial, leading to a comedic yet tense confrontation. Another arc delves into the romantic subplot between a human woman and an alien disguised as a human, highlighting the complexities of interspecies relationships. The series also introduces other alien races, such as the Color Rangers, a team of alien warriors with unique abilities, and the Dark Side aliens, who pose a more serious threat to Earth.

Prince Baka's character is central to the series, as his unpredictable behavior drives much of the plot. Despite his seemingly frivolous demeanor, he is highly intelligent and manipulative, often orchestrating events to test the reactions of those around him. Yukitaka serves as the grounded counterpart to the prince, providing a human perspective on the bizarre situations they encounter. Other key characters include Kraft, a loyal alien bodyguard tasked with keeping Prince Baka in check, and Misaki, Yukitaka's classmate who becomes involved in the alien-related incidents.

The anime blends humor with moments of suspense and intrigue, creating a unique tone that balances lighthearted comedy with occasional darker themes. The episodic structure allows for a variety of storytelling approaches, from slapstick humor to more introspective explorations of alien cultures and their motivations. "Level E" stands out for its inventive premise, engaging characters, and the interplay between its comedic and science fiction elements.