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.
Because you can't store magic power when you 
defeat monsters unless you have a Magic Crystal.
Wenn man keinen Magiekristall
mit sich führt,
Sin un cristal, aunque mate monstruos,
no podré acumular su magia.
Sin un cristal, aunque mate monstruos,
no podré acumular su magia.
C’est-à-dire que, sans cristal,
Perché non si può conservare il potere magico dei mostri 
che si sconfiggono senza averne uno.
Porque, sem um Cristal de Magia, não dá para
armazenar poder mágico ao derrotar monstros.
Если у вас его нет,
мана будет рассеиваться в пустоту.