Shinsuke starts training with Zanzou, who's recuperating in a mountain cave and requests payment in the form of food. Zanzou tells Shinsuke about his sister, and how she came to join the Dangaisyuu as a nun.
I'd guess this is an arrangement to receive 
sword instruction in exchange for food.
أظن هذا اتفاقًا لتلقّي دروس المبارزة
.مقابل الطعام
Wahrscheinlich bringt er ihm Essen,
um im Schwertkampf unterwiesen zu werden.
Supongo que le da lecciones de esgrima
a cambio de comida.
Supongo que le da lecciones de esgrima
a cambio de comida.
J’imagine qu’il l’entraîne en échange
de la nourriture qu’il lui apporte.
Immagino che abbia barattato quegli onigiri
per degli insegnamenti di scherma.
Parece que ele concordou em ensinar
a usar a espada, em troca de comida.
Наверное, он приносит ему еду
в обмен на обучение фехтованию.