Kariage-kun is an unmarried male office worker at Honnyara Industries, recognized by his close-cropped hairstyle. He possesses a mischievous personality, constantly devising elaborate pranks and schemes. His targets range from colleagues and superiors to broader society, with his department head, President Kinoshita, being a primary victim. His irony and sarcasm extend indiscriminately to anyone or anything nearby. Notable antics include publicly embarrassing his superior by broadcasting sensitive medical details over a park's PA system and orchestrating a deceptive community notice that culminated in a disappointing fireworks display where he ignited only a single small firework.

These pranks frequently serve as cynical social commentary, mirroring contemporary Japanese trends and societal conditions across different eras, such as the economic bubble and corporate restructuring periods. This dimension elevates his actions beyond simple mischief, offering subtle critiques of office culture and societal norms. Despite decades-spanning narratives chronicled chronologically with seasonal changes, his character exhibits minimal personal background or significant development. He remains a perpetual rank-and-file employee, steadfastly maintaining his core identity as a prankster prodigy throughout the serialization. His stories lack definitive beginnings or endings, focusing instead on episodic, self-contained comedic situations drawn from his daily corporate life and interactions. His established role as a static, yet iconic, figure embodying the frustrations and humor of Japanese corporate life remains consistent.