A man who died in an accident is reincarnated into the world of "High School DxD" with the intervention of a Goddess. 
To help him survive in this dangerous world filled with battles, the goddess grants him several reincarnation perks: a "Vigorous Body," the ability to wield the legendary martial art Mutsu Enmei-ryu, and the powerful bio-armor known as Unit Guyver. 
However, due to an error on the goddess’s part, his memories are erased, and he grows up living the life of a normal human.
In the spring of his third year of high school, he was killed by a fallen angel called Raynare. 
Before he can truly fade away, his classmate, Rias Gremory, reincarnates him as a devil. 
With this second reincarnation, his memories of his past life return, along with full access to his incredible powers. 
Armed with his newfound strength and resolve, he quickly rises to become a dominating force in the DxD world.
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Harem