A mother raises two sons alone after her husband dies. A boy at a temple hides two buns to give them to a kind family, but snow falls and he doesn't know where they are... The Tengu of Mt. Kurama gives Ushiwakamaru his father's sword, and trains him to become a great samurai.
His training continued 
until late in the night.
Entrenaba seguidamente hasta que oscureciera.
Estudiaba sin descanso hasta el anochecer.
Seu treinamento continuava até tarde da noite.