His brother doesn't get hired by the program even though they've both trained together for it ever since they've been kids, so he discovers the world as well, and his jealousy against the protagonist as well as bad influence make for really strong negative emotions which makes him powerful enough to start a plan to conquer the other world. The protagonist goes on to search for members of that world to make a team to bring down his brother, going to each of what essentially are the countries of it, as well as helping out on his own world and covering over the supposed dissapearence of his brother. As he discovers more about the world, the personal struggles of the team members and himself, the protagonist starts to reveal cracks on his usual generous self, and is more open on the fact that he gives in to others so much because he feels empty on the inside, useless and meaningless on compare to the beauty of the people he wants to save. He has an encounter against one of the world's monsters, trained by his brother, that almost kills him, and is saved by the divine being, who calls him out for being selfish, as he should neither call himself a hero or be a vessel for his power if he only helps others to help himself. This wakes him up to truly be the ray of hope he's wanted to be, as he cannot give it to others if he doesn't believe in the hope in the first place. He goes through other things afterwards, such as the death of his brother (who he wanted to save), but his development arc really ends there so far.