Tokyo, Japan – October 30, 2026 – The highly anticipated anime adaptation of Firehead’s popular light novel series, "Mercedes and the Waning Moon: The Dungeoneering Feats of a Discarded Vampire Aristocrat" (Kaketa Tsuki no Mercedes: Kyūgekki no Kizoku ni Tensei Shitakedo Suteraresō nanode Dungeon o Seiha Suru), has taken another significant leap forward with the revelation of four new cast members and a dynamic second promotional video. Hakuhodo DY Music & Pictures made the exciting announcement on Friday, further fueling anticipation for the series’ 2027 premiere.
The newly announced voice cast promises to bring a wealth of talent and experience to the forefront, breathing life into the richly imagined characters of this fantasy epic. Kenta Miyake will lend his powerful vocal stylings to the role of Benkei, a character whose presence often signifies strength and resilience. Ryūnosuke Watanuki has been cast as Kuro, adding another intriguing layer to the burgeoning ensemble. Esteemed voice actor Junichi Suwabe, known for his versatile performances, will portray Florian, while Ai Kayano, a beloved figure in the anime community, will voice Ryudia. These additions join the previously announced lead, Anna Nagase, who is set to embody the titular character, Mercedes Grunewald.
The release of the second promotional video offers a more in-depth glimpse into the anime’s visual aesthetic and narrative direction. While the exact details of the trailer’s content are not provided in the original source, its release signifies a crucial step in the anime’s marketing campaign, allowing fans to experience the animation, character designs, and thematic elements firsthand. This visual introduction is expected to further solidify the series’ appeal and attract a wider audience.
A Deep Dive into the Expanding Cast and Creative Team
The influx of new talent underscores the commitment to assembling a top-tier production for "Mercedes and the Waning Moon." The casting of Kenta Miyake as Benkei is particularly noteworthy. Miyake has a distinguished career, having voiced iconic characters in numerous acclaimed anime, including All Might in "My Hero Academia" and various roles in the "Fate" series. His commanding voice is well-suited for characters who exude authority and might.
Ryūnosuke Watanuki’s portrayal of Kuro is anticipated to be a significant contribution. While specific roles for Watanuki might not be as widely recognized as some of his veteran counterparts, his inclusion suggests a deliberate choice to bring fresh interpretations to the character roster.
Junichi Suwabe’s involvement as Florian adds a layer of gravitas and potential complexity to the character. Suwabe is a prolific voice actor, celebrated for his work as Archer in the "Fate/stay night" franchise, Undertaker in "Black Butler," and Grimmjow Jaegerjaquez in "Bleach." His ability to convey a wide spectrum of emotions will undoubtedly be an asset in developing Florian’s persona.
Ai Kayano, who will voice Ryudia, is a fan favorite, known for her roles as Menma in "Anohana: The Flower We Saw That Day," Darkness in "KonoSuba: God’s Blessing on This Wonderful World!," and Shiro in "No Game No Life." Kayano’s talent for portraying characters with warmth, vulnerability, and strength makes her an ideal choice for Ryudia.
These additions complement the previously announced lead, Anna Nagase, who will bring Mercedes Grunewald to life. Nagase’s performance is expected to be central to the anime’s success, as she navigates the complex journey of a reincarnated vampire aristocrat.
The production team behind "Mercedes and the Waning Moon" also boasts an impressive pedigree. Kunihisa Sugishima, a director with a rich history in the anime industry, is at the helm. His directorial credits include "Strike Witches," "Yu-Gi-Oh!," and "Beyblade: Metal Fury," demonstrating his proficiency in action-oriented and character-driven narratives.
The series scripts are being handled by Jun Kumagai, who has contributed to notable projects such as "Persona 4 the Golden Animation" and "Aquarion Logos." His experience in crafting compelling storylines will be crucial in adapting the intricate plot of the light novel series.
Character design is entrusted to Nami Shōyama, whose recent work includes animation direction on "Buddy Daddies," "Yu-Gi-Oh! Go Rush!!," and "Yu-Gi-Oh! Sevens." Her artistic vision will be instrumental in translating the visual style of the light novels to the anime medium.
The musical score, a vital element in immersing viewers in a fantasy world, is being composed by the dynamic duo of R.O.N. and Shōhei Mutsuki. R.O.N. has previously contributed to "The Classroom of a Black Cat and a Witch" and "Kuroko’s Basketball," while Mutsuki has worked on "The 100 Girlfriends Who Really, Really, Really, Really, Really Love You" and "Lycoris Recoil." Their combined talents promise a captivating soundtrack that will enhance the emotional resonance of the series.
The animation is being produced by Studio Teddy, a production house that has been involved in various anime projects, contributing to the visual realization of these narratives.
A Look Back: The Genesis of "Mercedes and the Waning Moon"
The journey of "Mercedes and the Waning Moon" from a web novel to a highly anticipated anime adaptation is a testament to its enduring popularity and compelling narrative. The light novel series, penned by Firehead, first emerged on the Shōsetsuka ni Narō website in 2018, quickly garnering a dedicated following for its unique premise and engaging protagonist.
The official print publication by TO Books, with illustrations by KeG, commenced in 2021, further solidifying its presence in the literary market. The release of the fifth novel volume on July 15 of this year signifies the ongoing narrative development and the publisher’s commitment to the series.
Complementing the light novels, a manga adaptation, illustrated by Pochi Edoya, also launched in 2021 on TO Books’ Comic Corona (now Corona EX) website. The manga has also seen consistent releases, with the sixth compiled book volume also published on July 15, demonstrating the multi-faceted appeal of the "Mercedes and the Waning Moon" universe.
J-Novel Club holds the English publishing rights for the light novel series, making the story accessible to a global audience through its digital releases. This international reach has undoubtedly contributed to the growing anticipation for the anime adaptation.
The Narrative Core: A Vampire’s Quest for Fulfillment
The overarching narrative of "Mercedes and the Waning Moon" centers on Mercedes Grunewald, a vampire who is reincarnated into a noble family. The story delves into the complexities of her new life, particularly the precarious position she holds within her family. As she faces the prospect of being disinherited, Mercedes finds herself responsible for the welfare of her mother and household staff.
The core of her struggle lies in her determination to secure a future for her loved ones. Recognizing the universal accessibility of dungeon crawling as a profession, Mercedes embarks on a path of rigorous training from a remarkably young age. Her innate vampiric heritage provides her with the potential for immense power, a crucial advantage in her quest.
Driven by the unfulfilled desires of her past life, Mercedes is resolute in her pursuit of a fulfilling existence. Her journey through the dungeons is not merely about survival but about carving out a destiny that will allow her "moon to be full," a poignant metaphor for achieving complete satisfaction and purpose. This theme of self-discovery and overcoming adversity, combined with the intriguing blend of fantasy and reincarnation tropes, has resonated deeply with readers and viewers alike.
The synopsis provided by J-Novel Club eloquently captures this essence: "Reincarnated as a vampire to a noble father and his shunned concubine, Mercedes Grunewald has always known that one day, her father will choose an heir that isn’t her. But what will become of her family when that time comes? Her mother has no skills, their maid is old, and Mercedes is but a small child. How will they survive in the world on their own? Luckily, dungeon crawling is a job that anyone can do—even a child. To provide for her family, Mercedes begins training at the age of a kindergartener, and because she’s from a nation of vampires, she fortunately has the potential to become strong. In her past life, she died unfulfilled, but that won’t be her fate this time. In the dungeons, she’s determined to find something that will make her moon full."
Immersive World-Building and Visual Promise
The release of new promotional materials, including the second trailer and a previously revealed main visual in September, offers tangible evidence of the anime’s commitment to visual fidelity and atmospheric storytelling. The main visual, in particular, serves as a powerful introduction to the series’ aesthetic, hinting at the epic scope and the rich fantasy world that awaits audiences.
The inclusion of character visuals for Benkei, Kuro, Florian, and Ryudia allows fans to see the distinct designs that will define these characters on screen. These visuals, coupled with the talent of character designer Nami Shōyama and the animation prowess of Studio Teddy, suggest a visually engaging and well-crafted anime.
The anime’s debut in 2027 is strategically positioned to capitalize on the growing demand for high-quality fantasy anime. With a strong source material, a talented cast and crew, and a clear vision for its visual presentation, "Mercedes and the Waning Moon" is poised to become a significant entry in the anime landscape. The expanded cast and the captivating second trailer are further testament to the dedication and excitement surrounding this promising adaptation.
The original article was published on October 30, 2026, by Crystalyn Hodgkins. This expanded report aims to provide a more comprehensive understanding of the project’s development and its potential impact on the anime community.
