I don't care whether you are a human or a monster. I only know that you are the one who made a vow to me thousands of years ago. Now it is time for you to fulfill your promise. Please love me!
After thousands of years and ten lives, although time passes by and people have changed, a trace of lovesickness and a promise are implicated in the fate of two people at the same time. Although humans and monsters have different paths, fate is difficult to control!