After a little incident, a bigger one occurs. Yato and Hiyori switch bodies. After that, comes bigger problems within the time. Especially because all of this is caused by jealousy.
You are the product of a series of twisted experiments, an anomaly that shouldn't have ever existed in the first place. Thankfully, you are taken into the arms of a hero and given a new purpose in life. But as you soon discover, it isn't easy to deny your true nature, especially when you were made to destroy.