Concrete (film)

 is a 2004 independently produced Japanese film that is based on the case of the murder of Junko Furuta. The film deals as much with the social factors that produced Furuta's four assailants as it does with Furuta's suffering at their hands.
The film involves four boys who kidnap a girl named Misaki. The boys rape, torture, and murder her in a similar manner to the manner of the boys who killed Junko Furuta.
Many people protested the film's release before it even premiered, and it was eventually relegated to specialty theater showings and a DVD release.
Plot.
Tatsuo Oosugi, a troubled working class teenager who frequently assaults his mother for divorcing his father and negligence, decides to join the yakuza to raise money for his future marriage with Kayoko Matsuyama after suffering burnout from the several low-paying jobs he undertook. Despite initially wanting to leave, he is given the opportunity to start a small gang called the Ryujin gang. He then recruits many of his friends to commit crimes like robbery and eventually, rape to please his seniors.
One night, they see a beautiful high school student Misaki going home on her bike. She is knocked over by one of the boys and Tatsuo pretends to take her home. When Misaki tries to go home by herself, Tatsuo reveals his true nature and threatens to burn her house down if she speaks up. Misaki is silenced as she is raped in a hotel and brought to the house of Takao Matsuyama, their friend and Kayoko's brother. There, the boys insert various foreign objects into her vagina, beat her and force her to lie to her parents over the phone that she is staying at her friend's house. Despite the horrific abuses, Misaki finds the courage to escape the house twice, with the help of Takao's mother in the second instance, but is nonetheless caught and punished by having her leg doused in lighter fluid and burned. Tatsuo also retaliates against Takao's mother by physically assaulting her and threatens the other boys with murder if they express sympathy with Misaki or help her escape. After several more abuses, which leaves her incontinent and dehydrated, Misaki begs the boys for water. Tatsuo, however, taunts her and fatally injures her by beating her further and dropping a barbell on her stomach. The gang then leaves the house to relax at a sauna whilst the dying Misaki expresses her last wish to "stay strong".
After returning from the sauna, the gang is horrified to discover that Misaki has succumbed to her injuries after she is unresponsive to Tatsuo putting a lit cigarette near her nose. He then decides to cover up the murder by getting a concrete drum from his old job and burying her body in it. The drum is placed in the open fields. Eventually, all of the boys are arrested and one of the detectives that previously met Tatsuo for his previous arrests angrily calls him a "demon seed" for trying to minimize his role in Misaki's murder, by claiming that he didn't intend to kill her and only killed one person. The site where Misaki's body is found has now become a gravesite for Misaki as the audience hears her, via a voiceover, asking whether people realize "how precious life is". The film ends with a crying Tatsuo in a dark room as he fails to make a mangled bird fly from his hand.