In present times, Gods and Demons coexist together with Humans after the door between each of these worlds had opened. Tsuchimi Rin is a normal young high school student attending Verbena Academy, spending his days living peacefully with his childhood friend Kaede. Unexpectedly, one day the King of Gods, the King of Demons and their families move into be Rin's next door neighbors. Apparently the daughter of the Gods, Sia, and the daughter of the demons, Nerine, are both deeply in love with Rin after having met him in the past. Along with his playful friendship with upperclassmen Asa and his encounter with the silent but cute Primula, Rin has much on his hands dealing with the affections of each of these girls. Based on the eroge by Navel.When two doors are discovered in an ancient ruin, the gateways to shinkai, the realm of the shinzoku (Gods) and makai, the realm of the mazoku (Demons) are irreversably opened. The races of human, shinzoku, and mazoku come together in the mortal world and nothing will ever be the same. One day, two new families move next door to a boy who had previously been living a very peaceful life.