Mitsuki goes to Yggdrasil alone?!

In order to protect his new family, the Wolf Clan, Yuuto has decided to return to Yggdrasil with Mitsuki, now his sworn partner for life. The two of them manage to deliver the news to their respective families, and at last the night of the summoning ritual arrives.

However, something strange and unexpected occurs! Due to interference by Sigyn, the Panther Clan's master of magical arts, Mitsuki is sent to Yggdrasil by herself.

The two lovers are once again separated across time and space; what fate awaits them?