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.
then 7, then 5, and then 7, 
then 7 more, 31 in total.
depois 7, então 5, depois 7 
e mais 7, totalizando 31.