Devilman Crybaby is a 2018 Japanese original net animation (ONA) series based on Go Nagai's manga series Devilman. The web anime is directed by Masaaki Yuasa, produced by Aniplex and Dynamic Planning, animated by Science Saru, and released by Netflix. Yuasa was offered the opportunity to create a Devilman project by Aniplex, and envisioned Devilman Crybaby. Announced in 2017 to mark Nagai's 50th anniversary as a creator, Crybaby was made available for worldwide streaming on January 5, 2018, as a Netflix original series.

The series updates the original 1970s setting to the 21st century but retains the basic premise of Nagai's manga, following Akira Fudo and his friend Ryo Asuka as they face an ancient race of demons that seek to destroy humanity. Believing the only way to defeat the demons is to obtain their powers, Ryo proposes that Akira unite with a demon; in doing so Akira transforms into the titular Devilman, gaining the powers of a demon but retaining the soul of a human. The anti-war themes of the original Devilman are reinterpreted as a metaphor for bigotry, in which manipulation and paranoia are discussed using the allegory of the demons as "the other". The anime's themes of puberty, sexuality, sex, love, and LGBT identity were explored in critics' analysis of the work, along with a debate over whether the series' perspective and ending are nihilistic.

Fans were divided in their response to Yuasa's take on Nagai's work, though the series' announcement and release were among the most widely discussed anime series released in 2018. Its viewership numbers are unknown as Netflix does not disclose these figures, though many journalists described the series as a hit. Critics assessed Crybaby favorably, with some calling it a "masterpiece", the best Netflix anime, and one of the best anime of the year overall and the decade. Although the response to its graphic content and ending was divided, its animation, soundtrack, characterization and faithfulness to the original manga were praised.

High school student Akira Fudo lives with his only friend and longtime crush, Miki Makimura, her brother Taro, and her parents, Noel and Akiko. When Akira attempts to defend Miki from a gang led by rapper Wamu, he is rescued by his childhood friend Ryo Asuka. Ryo tells Akira that his recent expedition to the Amazon rainforest revealed the existence of demons, but that the world's governments are suppressing this information.

Planning to expose the demons, Ryo takes Akira to the Sabbath Party at an underground nightclub; he attacks its patrons with a broken bottle, causing demons to appear. Ryo films the demons massacring the humans, but is attacked and pinned by a demon. Akira's will overpowers Amon, a powerful demon who tries to possess him, transforming him into Amon's demon form and allowing him to slaughter the demons. After fighting out of the Sabbath, Akira and Ryo fight several demons, including the sadistic Jinmen, who is responsible for the deaths of Akira's parents, Amon's lover Sirene, and her associate Kaim. At some point, Ryo eventually reveals on television that track star Moyuru Koda and fellow female athlete Miki "Miko" Kuroda are also demons, leading Akira to recruit them.

As the series progresses, Akira and Ryo's friendship becomes strained over time due to Ryo taking increasingly extreme actions to protect Akira's secret. At the same time, the revelation of the existence of demons triggers a global panic, causing riots and paranoia that begin to escalate as humanity turns on itself. In contrast, the demons begin to grip the world's population and possess humans on a large scale, thereby spreading fear and distrust throughout society. Disgusted by Ryo's apathy toward the chaos he has caused, Akira, alongside Koda and Miko, begins trying to find other Devilmen and resolves to contact them to form a team dedicated to protecting humankind from the demons.

Having become remorseful and confused by his actions, Ryo returns to the Amazon rainforest, where he claims he will acknowledge the origin of demons during a worldwide broadcast on national television, but instead publicly exposes Akira's identity by showing footage of his transformation into Devilman. This revelation causes the world to descend into chaos through mass violence and genocide; Miki's family falls victim to the police and is buried by Akira outside the city, while Miki and her friends take to social media to defend Akira, only to be violently murdered by a paranoid mob, who mistook them for demons. Devastated after witnessing the mob maniacally parading around with the dismembered bodies of his friends on pikes, the grief-stricken Akira incinerates the entire mob in retribution.

Betrayed, Akira soon confronts Ryo, who reveals he is the fallen angel Satan. Satan discovered the demons living on Earth after being cast out of Heaven. Though his body and the demons were destroyed by God in response to their savagery and violence, their souls endured their physical destruction from existence. Having reincarnated as Ryo, Satan explains that he intends to exterminate humanity to reclaim it for the demons, deeming their capabilities and simpler nature to be superior to the more complicated and weaker humans. He orchestrated for Amon to merge with Akira and become a Devilman, allowing him to survive in the world to come and to thank him for being by his side when he was human. Akira refuses to join Satan's cause and gathers the other Devilmen to fight Satan's army, but is defeated.