The moment of realisation

"He didn't hate himself though. He just hated the fact of being worthless. He hated that people's attention wasn't aimed at him. No matter what he did there was always someone better. His effort was just useless for others. He didn't things for himself. He had never been doing it for his own pleasure."

Bakugou's life had never been pleasant or amusing in any possible way, in fact it was just very hard. Sometimes he really wished he was dead but the love to people's attention directed at him, which was very rare incident, was simply way too much than just another reason to stay alive until one very sad morning which was the start of awful events for him and his whole family but with interesting person who was going to change his whole life.
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Basically just aroace bakugou meeting the reader (gender neutral) and they become besties very fun I would say totally no sad stuff only cool vibes

Tw:
- derealisation
- major character death