Mutsuo Toi cut the electricity line to the village of Kamo on the evening of 20 May, which left the community in darkness.

[2] Armed with a modified shotgun, a katana, an axe, several daggers and 200 rounds of ammunition,[3] he strapped two flashlights to his head and prowled through the village like a youth engaged in "night-crawling" or "Yobai" (夜這い), entering the homes of his neighbors.

[citation needed] He took part in "Yobai" (夜這い) or "night-crawling", a rural custom which involved creeping into young women's bedrooms during the night to seek sexual intercourse.

[4] His suicide notes indicate that after May 1937 he was diagnosed with tuberculosis, and the young women in the village rejected his sexual advances.

[7] The massacre was carried out in the small village of Kamocho Kurami, now part of the city of Tsuyama.

Toi left several long notes which revealed that he was concerned about the social impact of his tuberculosis, which in the 1930s was an incurable fatal illness.

It stars Masato Furuoya as Tsugio Inumaru, an emotionally distraught young man who goes on a violent killing spree after his tuberculosis keeps him from serving in World War II.