Creative Structure & Policy

• Music & Storytelling

  KATANA BROS is a project inspired by the legacy of Japanese video game music, combining original rock music with visual storytelling.

• Character Costume Design

  The costumes worn by the KATANA brothers are original designs that draw on the aesthetics of classic naval uniforms and sailor styles, reimagined to fit the world of KATANA BROS.
  Within the story, Aoi adds his own modifications and personal touches to these costumes, transforming them into a style that symbolizes the brothers’ individuality and creativity.

• Episode Structure

  KATANA BROS unfolds through an episodic format where music and storytelling intersect.
  Each song stands on its own as a complete work while also forming part of a broader narrative that portrays the characters’ emotions and development.
  EP1 through EP4 follow a single story centered on the KATANA brothers.
  From subsequent episodes onward, the universe continues to expand through music in a variety of forms, including standalone works centered on the world of each song and series built around specific themes.

• Performance Representation

  In KATANA BROS, instrumental performance and animation are not always depicted in perfect physical synchronization.
  While priority is given to conveying the energy, emotion, and atmosphere of the music, we also aim to reproduce the characters’ performance movements as accurately as technically possible.

• Voice System Philosophy

  About the VOICE SYSTEM
  The KATANA BROS VOICE SYSTEM uses voice synthesis software, with each voice carefully tuned to express the emotions of the characters.
  Vocal fluctuations, hesitation, breathing, and other subtle imperfections are treated as traces of emotion. Rather than pursuing absolute uniformity or perfection, we value the moments when emotion begins to move the voice.

• Use of AI in Anime Production

  Use of AI in Animation Production
  Some of the animation materials used in this project incorporate generative elements created with AI technology as part of the production process.

• FAN GUIDELINES

  KATANA BROS Fan Creation Guidelines
  
  KATANA BROS welcomes fan creativity and fan-made works.
  Through music, animation, and characters, we value the way creativity can inspire further creativity and new forms of expression.
  You are welcome to create and share fan works without prior permission, provided they remain within the scope of these guidelines.
  
  Permitted Fan Works
  ・Vocal covers and instrumental performance videos, including use of official karaoke tracks
  ・Fan art, including illustrations and comics
  ・Short animations and MAD videos
  ・Cosplay, including sharing cosplay photos and videos
  ・Introducing KATANA BROS works and sharing links on social media, video platforms, and similar services
  
  Conditions of Use
  Fan works are generally intended for non-commercial use.
  However, individual creators may monetize their fan content through built-in platform programs, such as YouTube advertising revenue or the TikTok Creator Program.
  This does not include selling fan works as merchandise or using fan works to advertise or promote products or services.
  Please also observe the following conditions:
  ・Fan works must not be presented in a way that could cause them to be mistaken for official KATANA BROS content.
  ・Fan works must respect the original works and the KATANA BROS universe.
  ・Fan works must not infringe upon the rights of any third party.
  
  Prohibited Uses
  ・Unauthorized redistribution of official music, videos, or other official content
  ・Claiming to be official or presenting fan works in a way that could cause them to be mistaken for official content
  ・Use for defamation, harassment, discriminatory expression, or political advocacy
  ・Excessively violent or sexual content
  ・Any use that infringes upon a third party’s copyright, image or likeness rights, trademark rights, or other legal rights
  ・Commercial use without prior permission
  
  Commercial Use
  If you wish to sell fan works, use them for advertising or promotional purposes, or otherwise use KATANA BROS-related fan works commercially, please contact us in advance.
  
  Credit Attribution (Recommended)
  Whenever possible, please include a credit such as:
  “Original music / characters by KATANA BROS”
  
  About These Guidelines
  These guidelines may be revised or updated as necessary without prior notice.
  
  Who will be the first in the world to cover a KATANA BROS song?
  Share your creativity with the world.