Prologue: The System

Issei after finishing his school day like everyday and gets beat up by the kendo club spying on them with his 2 friends find himself in the forest taking a walk thinking about his luck and his wish to have a harem of beautiful and older women but he then a small astroid comes crashing Issei this finds a strange device but he didn't know this device will change his life completely and make his wish come true with a cost.