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Decades later, the earth was invaded by species called beasts. Humanity was once in an extremely dangerous situation. Countless towns and even countries were destroyed because of this disaster. The seven ferocious beasts with absolute strength among the beasts were named by the surviving humans after the Seven Deadly Sins based on their respective characteristics. The only way to annihilate them is with weapons crafted from their own body tissue. The seven armed adapters (exemptors) from Youda Hall naturally shoulder the task of exterminating the beast herd and saving mankind...

The love story between a good-for-nothing young lady and Ming Ye, the ninth prince of the Night Kingdom, tells the story of how they knew and fell in love with each other.