Tsubame Kamoi used to serve in the JASDF before becoming the live-in maid for the Takanashi household. Her obsession with the job—and with Misha specifically—started years earlier, when she spotted the girl playing in the snow with her mother and fell head over heels for her.
Fast forward two years. Kamoi had left the military and was job hunting when she spotted the Takanashi help wanted flyer. Pretty normal so far, except she literally climbed a lamp post to get a better look and confirm it was the same Russian girl she'd been thinking about all this time. Misha was understandably freaked out. Despite the rocky introduction, Kamoi got hired anyway, much to Misha's annoyance.
As a maid, Kamoi's actually pretty solid—she can cook, clean, and handle whatever schemes Misha throws at her to try and get rid of her. She's not fazed by much, which only makes Misha more frustrated that her new employee won't quit.
Content compiled by AnimeList.moe from publicly available sources.