Haruhito starts living at his old friends' house, a shrine, because his parents traveled abroad on business. His old friends, Mai and Yuu, are pretty sisters, but he have never fallen in love with them since they are like family members to him. One day, Miharu and Iori, Mai and Yuu's cousins, start living at their house due to some circunstances. Miharu and Iori are also pretty, so Haruhito is happy to live with them. However, he soon gets involved in troubles.The god enshrined there suddenly appears in front of him and gives him the power of making babies. What will happen to Haruhito, who's got a strange power, and the heroines...?