ON-GAKU Studio Unveils Gorgeous New Hand-Drawn Indie Anime Short Rusuban

Acclaimed boutique animation house Rock’n Roll Mountain, the powerhouse studio guided by visionary founder Kenji Iwaisawa, has officially announced Rusuban, a beautiful new slice of life theatrical anime short film scheduled to premiere on August 1, 2026. Adapting the critically lauded manga by author Akiko Okuda, the project marks a significant stylistic departure for the production team. Moving away from the intensive rotoscoping techniques that defined their previous award-winning efforts, the 13 minute production leans heavily into pure hand-drawn artistry to capture a nostalgic, slow-paced human narrative.

Rusuban Anime Short Film Key Project Information

• Anime Title: Rusuban
• Animation Studio: Rock’n Roll Mountain
• Planning and Executive Producer: Kenji Iwaisawa
• Primary Genre: Slice of Life, Historical Drama, Iyashikei
• Original Manga Source: Shinzo, an anthology series by Akiko Okuda
• Official Studio Profile: @ROCKNROLL_MT Official X Account

What Is the Plot of Rusuban?

Translating literally to staying home or house-sitting, Rusuban centers entirely around a single, quiet day in the life of Tokko, a young Japanese girl who finds herself left behind to tend to a spacious suburban home while the rest of her family leaves for the day. Set firmly during the sweltering heat of August 1987, the narrative utilizes highly focused environmental atmosphere and subtle visual storytelling rather than over-the-top drama.

The adaptation explores themes of youthful independence, loneliness, and the secret magic found in mundane household isolation. Viewers follow Tokko as she navigates simple daily routines, interacts with lingering family belongings, and passes the quiet hours in a world completely isolated from modern digital connectivity.

Who Is the Creative Staff Behind Rusuban?

The short film serves as a major milestone for Rock’n Roll Mountain, serving as a showcase for rising independent industry talents:

• Director Ayumi Yanagisawa: Marking her official directorial debut, Yanagisawa stepped up to helm the project after gaining extensive industry recognition as the assistant director for Kenji Iwaisawa’s previous sports drama feature film, 100 Meters. Beyond her directorial responsibilities, Yanagisawa personally wrote the storyboards and managed the entire editing process.
• The Animation Team: The project prioritizes classical hand-drawn techniques executed by a talented wave of younger animators, including Yuuka Noguchi, Midori Makino, and Miku Akira.
• Scenic and Visual Design: The background art is crafted by artists Chisato Mansai and Pang Qi, while Ayame Sekiguchi curated the era-accurate retro color palette and served as production desk manager.
• Cinematography and Sound: Technical production is anchored by director of photography Veronica Horeva. The sound design is spearheaded by audio director Miyu Katō, mixing specialist Masaru Usui, and composer Yasuo Harada, who turned in a minimalist, period-appropriate musical score.

Who Is Part of the Rusuban Voice Cast?

The voice cast features an accomplished ensemble of voice actors selected to match the realistic, understated dialogue required by the period script:

• Kokoha Tachibana as Tokko
• Yuka Katō in a dual role, providing character vocals while simultaneously serving as the production dialect coach and structural supervisor.
• Atsuyoshi Miyazaki
• Mitsuho Kanbe
• Aimi Imai
• Akane Katsuki

Where Can You Watch the Rusuban Screening?

The theatrical premiere of Rusuban is scheduled for an exclusive week-long engagement running from August 1 to August 7, 2026, at the independent art-house venue K’s Cinema located in the Shinjuku district of Tokyo, Japan. To provide a complete cinematic retrospective for attendees, the special screening sessions will double as a double-feature package.

Alongside Rusuban, the venue will exhibit Yama, an influential 2010 independent short film directed by Kenji Iwaisawa himself. Yama is an adaptation of a cult short manga by Hiroyuki Ohashi, the brilliant writer behind the legendary animated feature ON-GAKU: Our Sound, which originally launched Rock’n Roll Mountain into global cinematic prominence.

What Are the Literary Origins of the Story?

The narrative of Rusuban is directly based on an award-winning short manga sequence originally written and illustrated by Akiko Okuda. The standalone story was published in July 2019 as a core component of Shinzo, a highly praised collection compiling six distinct independent stories exploring complex personal relationships and isolation. The anthology achieved notable commercial and critical acclaim, famously securing a fifth-place ranking in the competitive women’s division of the prestigious This Manga is Amazing! 2020 annual guidebook.

International anime fans looking to stream the studio’s earlier groundbreaking musical hit while waiting for eventual home-video distribution news for their newest shorts can access the full catalog on the official GKIDS Distribution Platform for North American territories, or track international indie licenses by keeping an eye on the digital hub of the Anime Limited Store across the United Kingdom.