Character Tuning
LLMs tuned to preserve each character’s personality, tone, and world, keeping conversations true to who they are.
Company
Company Name
90us, Inc.
Founder
Hayato Hoshikawa
Location
San Francisco, CA
Incorporated
January 29, 2026 (Delaware)
Contact
Product
Entertainment × AI
Kana
Your Japanese language partner
Come for the characters.
Stay for the conversation.
More people are discovering Japanese through anime, manga, and other parts of Japanese culture. Kana is developing an app that lets you learn real Japanese through conversations with your favorite AI characters. By bringing entertainment and AI together, we aim to make language learning fun and easy to stick with.
Strength
Core Technology
Generative AI.
Built for connection.
We optimize generative AI and LLMs for entertainment experiences, with proprietary tuning that brings character personalities and natural voices to life.
Japanese TTS
AI speech synthesis tuned for natural Japanese, with expressive intonation and emotion that bring conversations to life.