Sandra finds herself in a strange predicament—pretending to be her younger brother's girlfriend. She faces jealousy from his fans and awkwardness with her own crush. This novel was originally published by Shueisha D-Novel f under the title "The Serious Maid's Engagement Trouble! ~It Turns Out the Silent Knight Commander Was Secretly Head Over Heels for Me~". This version includes over 70,000 additional words.