Based on the novel by Osamu Dazai and distributed by ATG. The story of a young man who is caught between the breakup of the traditions of a northern Japanese aristocratic family and the impact of Western ideas. In consequence, he feels himself "disqualified from being human" (a literal translation of the Japanese title) and goes down the stairs to self-destruction step by step.
The Kumakichi Ishida family lived happily in a small house in Shibuya while their mansion in Azabu was requisitioned by the occupation forces. When the residence is released to them, Mrs. Ishida wants to turn it into a Western style hotel to recoup their fortunes, but returns to Shibuya, swindled and sober.
Soldiers Hayate and Yaheiji secretly escape from their besieged castle. Hayate has left behind his lover, Kano. On his way, Hayate is wounded and cared for by O’Ryo, who falls in love with him. But when Hayate accidentally kills her caretaker, he flees, with O’Ryo in pursuit. Subsequently, Hayate's comrade Yaheiji falls in love with Oryo. Kano, the lover left behind by Hayate, believes him dead, and becomes involved with another soldier, Jurota. When Jurota defects to the opposing army, he takes Kano with him. A double set of love triangles has developed, wherein each man and each woman loves one and is loved by another. Finally only combat and self-sacrifice can untangle the weave.