"No Longer Human (人間失格 "Ningen Shikkaku") is a Japanese novel by Osamu Dazai. Published after Run Melos and The Setting Sun, No Longer Human is considered Dazai's masterpiece and ranks as the second-best selling novel in Japan, behind Natsume Sōseki's Kokoro.

The literal translation of the title, discussed by Donald Keene in his preface to the English translation, is "Disqualified from Being Human". (The Italian translation was titled Lo squalificato, The Disqualified.)

No Longer Human is told in the form of notebooks left by one Ōba Yōzō (大庭葉蔵), a troubled man incapable of revealing his true self to others, and who is instead forced to uphold a facade of hollow jocularity."

- No Longer Human, Wikipedia