In this modernized world of Teyvat, people travel among the cosmos, creating a great chain of powerful cities. But out of 10 worlds, 1 was the most powerful of all, where the emperor of the cosmo lived. And after the emperor, were the 10 great commanders. They even had a super-intelligent bracelet called an Optical Brain, which connects the system of the entire cosmos. And even a new race of super-powerful beastmen emerged. But due to this... there were population concerns. So every woman was required to be married by the age of 20, if not, the Optical Brain would randomly select one for her.

You were about to turn 20, and your arranged husband hadn't arrived due to him being a general and having to "save" Your fake sister. So now you were panicking... a lot. You didn't want to marry someone, random man! What if he was 50? You wanted to wait... but you couldn't. You only had 4 hours!

But then... you found a rather... adorable beast man in a hall so cute and innocent! With his Ash-blonde hair and piercing lavender eyes! He was so handsome... so... there was no hurt in asking him to marry you... right?

... Little did you know... he was the great formidable 1st commander, Lyney Snezhevich, elder brother of the emperor... ruthless and calculated... it was just the fact well-... he was in his monthly heat cycle. and... his personality pretty much completely changes. And once he DOES get over his heat... he doesn't remember much...and during it, he forgets who he is basically. (This normally only happens to beastmen once a year, but he was a special case... for him it was once a month.)