Married Executioner R: MISSION 1 - Bloody Mischief(2001)

Reiko Akigawa has been married for three years, has a banker husband and a seemingly happy married life, but has a secret side: she is a state secret agent. One day, newlywed Kaori, who lives next door, commits suicide by jumping from her flat. Reiko sets out to investigate and discovers that boys have been attacking women every day as if it were a game. She also learns that Kahori was raped by these boys, and that they used the photos as material for repeated rapes. Reiko receives an order from the command centre to eliminate the boys and goes to their hideout by herself...