"Zipman!!" is a manga series that centers around Kaname Uno, a high school student with a passion for creating inventions. Kaname's older brother, Akira Uno, is a famous superhero known as Captain Nii-chan, who protects the city from villains. However, Akira mysteriously disappears, leaving Kaname to uncover the truth behind his brother's vanishing. During his investigation, Kaname discovers a powerful suit called the Zip Suit, which grants its wearer superhuman abilities. Determined to find his brother and continue his legacy, Kaname takes on the mantle of a hero, adopting the identity of Zipman.

The narrative explores Kaname's journey as he balances his ordinary life with his newfound responsibilities as a superhero. The Zip Suit enhances his physical capabilities, allowing him to fight against various adversaries, including rogue scientists, criminals, and other threats to the city. Along the way, Kaname encounters allies and enemies, each with their own motivations and connections to the Zip Suit's origins. The story delves into themes of family, responsibility, and the challenges of living up to a heroic legacy.

Key characters include Kaname's classmates, who provide support and comedic relief, as well as antagonists who test his resolve and abilities. The series blends action, humor, and emotional moments, creating a dynamic narrative that keeps readers engaged. As Kaname uncovers more about the Zip Suit and his brother's disappearance, the stakes rise, leading to intense confrontations and revelations about the true nature of heroism. The manga maintains a brisk pace, balancing episodic battles with an overarching mystery that drives the plot forward.