Criminal Investigator Bullet Holes of Revenge

Misaki, a criminal investigator, fails to rescue an exchange student, Yilin, who was imprisoned by a gang, and ends up letting her die. Then, he takes charge of protecting Yi-Ling's mother Ling-en and older sister Fei-Fei when they come to Japan, but Ling-en is shot again at the crime scene where they went to lay flowers.