Strange Tales of Bureau 749

At a secret base belonging to Bureau 749, a group of people in black uniforms fight to protect humanity. They are called the "Guardian Special Unit," also known as the "Guardians." Every mission means facing unknown dangers and fear, and they have to be ready to give their lives to fulfill their duty.

One day, the Guardian Unit receives a mission: rescue a kidnapped scientist. The scientist is an important figure whose research could make the world a better place, so the Guardians must risk their lives to carry out the mission. They think it will be a simple assignment, but soon discover they're wrong. They find themselves caught up in a grand adventure across the modern city.