In the high-octane action-comedy series Buddy Daddies, two elite hitmen find their solitary, dangerous lives turned upside down when a four-year-old girl unexpectedly enters their world. Kazuki Kurusu, a charming and impulsive playboy, and Rei Suwa, a cold and efficient loner, are professional assassins for a shadowy organization, living by a strict code of detachment and violence. Their carefully controlled existence is shattered when they are tasked with eliminating a target, only to discover his young daughter, Miri, has witnessed the crime. Unable to leave her to a grim fate, the mismatched pair makes the reckless decision to become her reluctant guardians. Now, they must juggle brutal contract killings with the bewildering challenges of parenting, including daycare drop-offs, cooking lessons, and bedtime stories. Voiced by Toshiyuki Toyonaga as Kazuki and Koki Uchiyama as Rei, this series blends heart-pounding action with surprisingly tender domestic comedy, exploring themes of found family and redemption. As the two assassins slowly learn to care for Miri, they must also contend with their dangerous pasts threatening to catch up with them, putting their new, fragile family unit in constant peril.