Seme is ancestor's god to protect original body owner nishi's family. But their souls are swapped and yozou trapped in it. Then he met uke komiya who is employee of bookstore of seme. Since some kind of water spilled on seme yozou, he turned to child and every night at 2 a.m he returns to his original human form. It is a different and good story.
Ushimitsu Dokidoki Koshotentan