The opening shot of Akuma Kun is a close-up of Ichiro Umoregi’s fingers tracing the intricate lines of a summoning circle, his voice whispering an incantation in Latin. It’s a moment that immediately sets the tone for this Netflix ONA: eerie, intellectually curious, and steeped in the occult. Directed by Junichi Sato (returning from the 1989 anime series) and produced by Toei Animation, this 2023 adaptation aims to modernize Shigeru Mizuki’s classic manga while retaining its core themes of demonology, mystery, and societal critique.

At its heart, Akuma Kun follows Ichiro Umoregi (Yuki Kaji), a boy raised by demons, as he teams up with his half-human partner Mephisto III (Toshio Furukawa) to solve supernatural crimes. The dynamic between the two leads is the series’ strongest asset. Their banter is sharp and their investigative partnership feels authentic, grounded in Ichiro’s analytical mind and Mephisto’s world-weary experience. Yuki Kaji delivers a standout performance, capturing Ichiro’s social awkwardness (a trait that some viewers have interpreted as autistic coding) with nuance and depth. His portrayal of Ichiro is a study in contrasts—brilliant yet socially inept, compassionate yet detached—and Kaji navigates these complexities with remarkable skill.

Toshio Furukawa, a veteran voice actor, brings a gravitas to Mephisto III that anchors the series. Their chemistry is palpable, and their interactions drive much of the series’ narrative forward. Supporting performances are equally strong, particularly Ryoko Shiraishi as Sanae Kazama and Yumiri Hanamori as Mio Kazama, who add emotional depth and complexity to the story.

The dark visuals are indeed captivating, with a color palette that leans heavily into shadows and deep reds, enhancing the series’ gothic atmosphere. The sound design is equally impressive, from Izutsu Akio’s haunting main theme to the eerie background scores that heighten tension during investigation sequences. The series also excels in its use of folklore, drawing from myths and legends worldwide to populate its roster of demons. This attention to detail lends an air of authenticity to the supernatural elements, making them feel more grounded and less fantastical.

However, Akuma Kun isn’t without its flaws. The pacing can feel rushed at times, particularly during episodes where multiple cases are solved in quick succession. Some storylines feel underdeveloped as a result, with potential for deeper exploration of themes left untapped. Additionally, while the series’ commitment to grounding its supernatural elements in research is admirable, it occasionally veers into overly didactic territory, slowing down the narrative momentum.

The series also struggles with tonal consistency. While the darker, more mysterious cases are compelling, lighter moments—intended to provide levity—often fall flat or feel out of place. This inconsistency can make the series feel disjointed at times, as it tries to balance its various tonal elements. For instance, an episode might open with a chilling murder investigation, only to pivot to a comedic subplot involving Ichiro’s attempts to navigate human social norms. While these moments are intended to add depth to Ichiro’s character, they often feel jarring and disrupt the series’ overall flow.

Despite these missteps, Akuma Kun offers a fresh take on the classic manga, with strong performances, striking visuals, and an engaging central duo. The series is particularly noteworthy for its exploration of complex themes such as the nature of good and evil, the ethics of using supernatural power for human ends, and the struggle to find one’s place in the world. These themes are woven throughout the narrative, adding layers of depth that elevate Akuma Kun above more straightforward mystery anime.

In terms of genre fit, Akuma Kun straddles several genres—animation, sci-fi & fantasy, mystery, and crime—and manages to blend them seamlessly. The series’ supernatural crimes are as compelling as its human ones, and the fusion of folklore with modern investigative techniques creates a unique viewing experience. This genre-blending is one of the series’ standout features, appealing to fans of both mystery and fantasy genres.

The series also benefits from its original net animation (ONA) format, which allows for more creative freedom and flexibility in storytelling. The ONA format enables Akuma Kun to experiment with narrative structures and visual styles that might not be possible in a traditional television series. This experimentation is evident in the series’ use of surreal imagery and non-linear storytelling techniques, which add an extra layer of intrigue to the viewing experience.

In conclusion, Akuma Kun is a series that offers much to appreciate, from its strong performances and striking visuals to its complex themes and genre-blending narrative. While it may struggle with pacing and tonal consistency at times, these flaws do not detract significantly from the overall enjoyment of the series.