Name a game/movie/book where so much bad has happened, the protagonist winning in the end was still a loss (SPOILERS)

Super Fire Pro Wrestling - The main character did everything he could to become the champion wrestler, even losing two of his friends, his coach, and his girlfriend, that, when he did reach the top, he had no one to share his glory with, and a couple days later, shot himself in his own home. Also made by Suda51, so there you go