KHD

A teen, his schoolmates, his guardian, his teacher, transported to another world to help save the human race from destruction against the 72 Demon Lords. However what will happen when this teen becomes an Ex-Hero. Hunted by both Human and Demons. His troubles know no bounds, but lucky the Gods, Reincarnated and his every so growing harem are by his side. Watch him grow stronger and stronger and OP cannot just describe this guy, i mean OP, but... there are other people who are more OP than him!