It's peace time in Japan in 1640, leaving many samurai out of work and impoverished. The wealthy house of Li have become aware of ronins (masterless samurai) asking feudal lords to let them use their courtyards to commit ritual suicide, knowing that they will take pity on them and pay them off instead. When ronin Hanshiro (Ebizo Ichikawa) asks unsympathetic clan lord Kageyu (Koji Yakusho) for the use of his courtyard, Kageyu recounts the tale of young Ronin Motome (Eita) who was forced by Kageyu to go through with the ritual and cut out his own heart despite only possessing a wooden blade. Unknown to Kageyu, Hanshiro was Motome's father-in-law and is seeking revenge for his cruel death.