I Grew up Secretly in the World of Giants

Little brother Allen, you are still going dark, so you should stay with Mikasa. Once again, Rin traveled to the world of giants. Although there was a system, the system was so sinister that it didn't even provide plug-ins. Rin can only rely on himself. Can he change the ending this time and save the life of the character he cares about? (The rule of this novel is that Sasha cannot die.) In addition, the plot will not be specially modified, and the protagonist is not a bad character at the beginning. It is not a mindless story, so you can eat it with confidence.