Kill Blue is a fast-paced action-comedy manga that cleverly blends assassination, youth comedy, and school life, following Juzo Ogami, a legendary middle-aged hitman whose life is turned upside down when a mysterious wasp sting de-ages him into a middle schooler, forcing him to infiltrate an elite academy while hiding his deadly skills and adapting to modern teenage life, resulting in a sharp mix of high-level combat, undercover missions, and humorous culture clashes as Juzo balances protecting his cover, surviving school politics, and confronting new threats from the criminal underworld, delivering stylish action, comedic timing, and surprisingly heartfelt moments that explore identity, aging, second chances, and personal growth, making it a refreshing and entertaining modern shonen series that appeals to fans of both action and comedy-driven storytelling, also known as Kill Blue manga, Kill Blue Shonen Jump, キルアオ, Kiru Ao, Kill Blue assassin manga, middle-aged assassin manga, and school action comedy manga.