Fics like Nanatsu no Taizai: The Flare of Liones

After being killed by the Sludge Villain, Izuku finds himself appearing in a strange city. He doesn't know where he is and is taken in as a Squire to a man who calls himself Zaratros. For the next 3 Years, he is trained to become a Holy Knight next to the man's son Gilthunder. When the Holy Knights stage a coup, and Zaratros is killed. Izuku watches the event happen, and while he can't do anything to the two Great Holy Knights, he doesn't forget their actions. Fast forward a decade later, and the Holy Knights are taking over the Kingdom of Liones. In a bid to keep the Princess safe from the Holy Knights, King Bartra sends Holy Knight Izuku to protect his daughter. All for the singular mission to find the Seven Deadly Sins.

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