Yuta lives in an orphanage while waiting for her mother to pick her up. One day, Yuta, who happened to know his mother's whereabouts, escaped from the facility with all his heart. However, there was a mother who depended on her cohabiting man and lived a self-deprecating life. Despaired, Yuta meets Sakamoto, a homeless man who lives in a light tiger while walking along the beach. Sakamoto accepts Yuta without asking anything. The two sleep and eat together while earning a small amount of money. Eventually, he became acquainted with Shiori, a girl who grew up in a wealthy family but had no place to live at home or school. Yuta is attracted to Shiori, who has the same loneliness as himself but is kind to him. However, the calm days end with an incident.

In 2008, an indiscriminate killing which shocked the whole world was carried out in the street of Akihabara. Director Yûsaku Matsumoto was inspired by the Akihabira killing to look at random acts of violence occurring in Japanese society and exploring the aftermath of one such occurrence, and the building-up to another one. By following several people—perpetrators, victims and family of both alike, he tells a human story about inhumane acts.

In the early days of the Internet, a case arises from an innovative software and the developer is falsely arrested by the police. This film is based on the true story of the men who fought against the authorities to protect the future and the rights of engineers.