(There is a world where human and demon are living their live as friends and close family kinda,but there's a rumors about Demon's Secret and the rumors started spread far.Human started to have less trust to demon until one day,demon declared a war against human and the war last 2 hours until The Red Dragon arrived to stopped the war by splitting to two island,one for human and one for demon) Iruka,who is normal human with no magic has been summoned with his family to this world by 'A Mysterious Book' they get from someone posted it to them.Why were they been summoned?What is the connention between Iruka and 'this' world?What is the book that summoned them?Who gave the book to them?