Nostalgia plays a significant role in Takemichi's quest to change the past in the anime "Tokyo Revengers." Takemichi is deeply nostalgic for his youth and his relationships with his friends from his middle school days. This nostalgia drives him to try and change the past, as he wants to prevent the tragic events that occurred and salvage the relationships he once had. It motivates him to confront his past self and make different choices in order to create a better future for himself and those he cares about.