18歳、新妻、不倫します。

Umeka is the heiress of the powerful conglomerate known as the “Sanjo Empire.” She has never been in love, but upon graduating high school, she will surely be forced into a suitably arranged marriage. Before that happens, she decides to fake a marriage with her bodyguard, Kira. It seemed like she was going to get away with the scandalous relationship, but... (Source: Shogakukan, translated) Note: Includes 10 extra chapters.