Notes about the story

This is a story about a famous contract killer and a well-known vigilante named Amamiya Ren.

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This japanese vigilante used to be in a killing spree saving other people's life while at one time he decided to be a contract killer. Until he met a group consist of 9 girls.

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Will he decide to go back from contract killing to be a vigilante that everyone loves?

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What are the reasons he decided to stop doing his vigilante work and start a killing contract.