Yuma Uchida about Megumi's growth/change after Shibuya:
From Megumi's perspective, all of his previous battles always included the possibility of "ultimately ending with my own death." Compared to that, I think the change is that he's developed a strong will to "Win, even if it means I die."
Rather than giving up on himself and accepting defeat, I think he has a better idea of who he wants to be than before