In this chapter, we learn that the protagonist's brother is not his real brother, but a "fiendfire" imposter. The protagonist explains that he has to find out what's going on in the game before he can figure out the truth about what happened to his brother. He's worried that if the fake brother shows up, the company will know that he's been spying on them, and he'll be at risk of brain damage. He decides to stay in the dungeon until he can find out.