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The King is ill and must step down from his throne. In order to do so, he must pass his crown to the next heir; his youngest son, who must pass the trial so he can earn it. However, an unfortunate series of events leads the little prince into failing, and even being tricked into near death.

Now shunned, the Prince must find a way to earn his honour back by slaying monsters throughout the Kingdom. However, by doing this, he must cut down monsters with a blade that acts as a double edged sword; as he kills, he collects the souls within his sword, which becomes part of him.

It's the duty of a Prince to become a King; is that what this story will be about?