Michio enters the labyrinth with Roxanne and learns more about the world. He realizes the actions he'd been taking based on assumptions have been terribly inefficient. With the knowledge he learned from Roxanne, common video game strategy, and skill settings, Michio develops a method to efficiently make money.
A person sells Magic Crystals only a handful 
of times over the course of their life.
On vend rarement plus
d’un cristal magique dans sa vie !
Di solito una persona vende solo pochi Cristalli Magici
nel corso di tutta la sua vita.
Uma pessoa vende um Cristal de Magia
poucas vezes durante a vida.
Поэтому и за всю жизнь
их не так уж и много продашь.