Blue Bloods

What if instead of being 15, Rin was only 9 when Satan sends his demons to retrieve his son. But this time there's no Shiro to protect Rin, and our favorite half demon ends up in Gehenna. As he grows up inside Gehenna, Rin makes the best of his situation; he makes friends, gains strength, and desperately tries to get back to Assia to see his brother and family.- Blue Bloods