18-sai, Niizuma, Furin Shimasu.
18歳、新妻、不倫します。
Umeka, the heiress to the influential Sanjo Empire, has no experience with love. After high school, she expects to be required to enter an arranged marriage. To avoid this, she pretends to be married to her bodyguard, Kira. Initially, the fake relationship appears to remain undiscovered, but complications soon arise.