Unlimited Life (DISCONTINUED) (High School DxD X Fate)

This story is discontinued and I will probably rewrite it if I want to

In this story, not like others. Basically our main character is Shirou and he's different. He's my own Shirou :) I don't know what should I title it ;)
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Shirou is a boy whose parents died because of an incident. He saw many pain and felt pain. He want to save everyone but he's just too weak. Later, there is one thing that changes his life.