A naturally gifted but untrained classmate who can play a mysterious forest piano barefoot. He initially rejects formal lessons but accepts coaching from Sousuke Ajino to master Chopin and enter a national competition. During the contest, he abandons strict rules to play his own adaptation of Mozart's sonata, leading to disqualification but earning public applause. He leaves town after promising Shuhei to become the best.
Kai provides emotional support and practical focus techniques to Takako.
Fellow students who quickly form a close bond through shared musical interests.
Explore the full interactive character relationship map of The Piano Forest