The highly anticipated first instalment of the Demon Slayer: Kimetsu no Yaiba – Infinity Castle film trilogy has unleashed its main trailer, confirming that renowned musical artists Aimer and LiSA will once again lend their formidable talents to the franchise by performing the theme songs. This announcement has ignited excitement among fans, promising to elevate the cinematic experience with the powerful vocal contributions from two artists deeply embedded in Demon Slayer‘s musical legacy.
The Dawn of the Final Battle: Unveiling the Infinity Castle Arc
The Demon Slayer: Kimetsu no Yaiba – Infinity Castle films are set to adapt the climactic final arcs of Koyoharu Gotouge’s manga, specifically the “Infinity Castle” and “Sunrise Countdown” arcs, which form the “Final Battle” portion of the series. This marks the definitive conclusion to Tanjiro Kamado’s harrowing journey to avenge his family and cure his demon-turned sister, Nezuko. The anime’s fourth season, the Hashira Training Arc, recently concluded, serving as a crucial prelude to these cinematic events, as the Demon Slayer Corps prepares for their ultimate confrontation with the progenitor of all demons, Muzan Kibutsuji.
Unlike previous cinematic entries like To the Swordsmith Village or To the Hashira Training, which served as compilation films, the Infinity Castle trilogy is a full-fledged feature-length adaptation, akin to the monumental Mugen Train film. This decision by Ufotable, the acclaimed animation studio behind the series, underscores the arc’s immense scope, intricate plot, and the profound emotional and action-packed moments it promises to deliver. Haruo Sotozaki, who has directed previous instalments of the anime and films, returns to helm this ambitious project, ensuring a consistent and high-quality artistic vision.
The Infinity Castle: A Labyrinth of Despair and Battle
At the heart of this concluding saga lies the titular Infinity Castle, an otherworldly, extradimensional fortress crafted by the Blood Demon Art of the Biwa Demon, Nakime. This eerie domain serves as Muzan Kibutsuji’s shifting stronghold, a labyrinth of endless wooden rooms, halls, and gravity-defying passages that bend to Nakime’s will. Within its bewildering confines, the Demon Slayer Corps will be scattered, forced to confront Muzan’s most formidable Upper Rank demons in a series of desperate and intense battles that will determine the fate of humanity.
The newly released main trailer offers a gripping glimpse into the high-stakes confrontations that await. It notably teases the highly anticipated showdowns, including the return of the Upper Rank Three demon Akaza, who tragically defeated the Flame Hashira Kyojuro Rengoku in the Mugen Train arc. Fans can expect to witness the intense clash between Tanjiro and Water Hashira Giyu Tomioka against Akaza, a battle laden with emotional weight and stunning choreography. Other glimpses within the trailer imply key confrontations such as Shinobu Kocho facing Doma and Zenitsu Agatsuma confronting Kaigaku, promising a relentless barrage of action sequences that are expected to set a new standard for anime battles.
A Symphony of Battle: Aimer and LiSA’s Return
The inclusion of Aimer and LiSA as theme song artists for the Infinity Castle film is not merely a casting choice but a strategic embrace of the musical cornerstones that have helped define Demon Slayer‘s overwhelming success. Their distinct styles and powerful vocals have become synonymous with the franchise’s emotional depth and thrilling action.
Aimer: “A World Where the Sun Never Rises”
Aimer, known for her melancholic yet potent voice, will perform the theme song “A World Where the Sun Never Rises” (“Taiyō ga Noboranai Sekai”). Her previous contributions to Demon Slayer include the immensely popular opening theme “Zankyo Sanka” for the Entertainment District Arc and the ending theme “Asa ga Kuru.” “Zankyo Sanka” became a global sensation, reflecting Aimer’s ability to craft songs that resonate with the series’ blend of dramatic action and emotional resonance. Her return signifies a continuation of this artistic synergy, promising a theme that encapsulates the gravitas and despair of the Infinity Castle, where sunlight—a demon’s ultimate weakness—is but a distant memory.
LiSA: “Shine in the Cruel Night”
LiSA, a powerhouse vocalist renowned for her energetic rock anthems and deeply emotional ballads, will deliver “Shine in the Cruel Night” (“Zankoku no Yoru ni Kagayake”). Her relationship with the Demon Slayer franchise dates back to its very beginning, with “Gurenge” serving as the iconic opening theme for the first season, catapulting both the song and the series to global prominence. She further solidified her legendary status with “Homura,” the poignant theme song for Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen Train, and “Akeboshi,” the opening theme for the Mugen Train Arc TV series. LiSA’s consistent ability to capture the essence of Demon Slayer‘s heroism, struggle, and unwavering hope makes her return for “Shine in the Cruel Night” a profoundly fitting choice, hinting at themes of resilience amidst overwhelming darkness.
The Anticipation Builds
The collaborative efforts of Aimer and LiSA are more than just musical additions; they are integral components of the Demon Slayer experience. Their songs have historically amplified the emotional stakes and action sequences, becoming anthems for fans worldwide. The announcement of their involvement in the Infinity Castle films ensures that the concluding chapters will not only be visually stunning and narratively rich but also sonically unforgettable.
The first film in the trilogy, Demon Slayer: Kimetsu no Yaiba – The Movie: Infinity Castle – Part 1: Akaza Returns, is scheduled to premiere in Japan on July 18, 2025. International audiences will not have long to wait, with Crunchyroll and Sony Pictures Entertainment confirming a global theatrical release beginning August 12 in Southeast Asia, and expanding to over 70 countries. Fans in the United States, Canada, and the United Kingdom can mark their calendars for September 12, 2025, when the film will be released in both Japanese with English subtitles and English-dubbed versions, including IMAX and other premium large formats.
The decision to adapt the final arc into a trilogy of films allows for a meticulous and expansive retelling of the manga’s emotionally charged conclusion, ensuring that no detail is overlooked in this epic final battle. As the Demon Slayer Corps prepares for their fiercest confrontation yet, the return of Aimer and LiSA promises to imbue every moment with the powerful musicality that has become a hallmark of the Demon Slayer legacy, setting the stage for an unforgettable cinematic farewell.
