Tiny Law is a female soldier belonging to the 12th Company of the 4th Division of the Laos Liberation Army. Born between a Japanese father and a Laotian mother, Tiny is a sniper who is known as a sniper despite being only 17 years old. One day, Muang Loa Air Base, where Tiny and his friends are stationed, is attacked by a helicopter unit of the government army. The base was destroyed, and her brother, who was her only blood relative, was a tragic corpse.

Three Japanese mercenaries, Takaoka, Inomata, and Todo, betrayed the Liberation Army and leaked information to the enemy. The three of them once saved Tiny's life on the battlefield, but they were blinded by the huge rewards from the Japanese yakuza who wanted to develop a drug route with Laos and sold their friends. By order of the Liberation Army Headquarters, Tiny follows the three of her returning home to Japan, which is also her late father's home country. Set in Shinjuku, a fierce battle between a talented sniper girl, yakuza, Chinese mafia.