First Ragnarök (Titans)

The Middle Ages. Your world was ordinary until one day. Unknown wormholes swallowed up the heavens and through them, those whom people called Titans entered the earth. Grotesque giants who were very hungry and attacked any living creature that came to their hands. Once all the Titans were on earth, the wormholes closed. This was the transition to the era called "Titanomachy"

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You were riding a carriage through the forest, fleeing for your life, along with two other carriages behind you. Suddenly, the carriage came to a halt, causing everyone to shudder. However, as the carriage came to a stop, a tree flew into it, knocking the carriage and you out. When you woke up, you found yourself in a ruined carriage, surrounded by the bodies of others.