Issei Hyoudou, the Ring-Bearing Wizard

Phantoms. Entities born from the bodies of despairing people with magical potential (Gates). Powerful, strong and threatening, the only one able to oppose them is a boy, using magic. But what will happen when this boy realizes that the Phantoms are not the only supernatural beings on the Earth and gets embroiled in their bussines? LessPerverted/OOC/Strong/SlightlyOP!Issei x Harem