A Day in Mikasa's Life at the Office (ＯＬミカサのよくある一日 Ōeru Mikasa no Yoku aru Tsuitachi?) is the 18th chapter of the 1st volume and the 18th chapter overall of the Spoof on Titan manga, written and illustrated by hounori.
At the office, Mikasa impresses her coworkers with her quick typing, but what she is really doing is sending e-mails to Eren about dinner and the pattern on his boxers. Eren trashes them all, but then Mikasa sends him another message telling him that the data from a meeting the other day was inside one of her earlier e-mails.
Lunch time arrives and Mikasa tries to give Eren a lunch she made, but he goes to the convenience store with Connie before she can tell him. Mikasa ends up eating lunch with Sasha, who is amazed that she packs two meals for herself.
Later, Eren gets chewed out by his boss, Levi, and goes back to his desk. Mikasa notices that he is dejected and tells him that if he receives any work he cannot handle, she will take care of it. Eren clarifies that the conversation was not about his work. It is that his desk is messy.
Eren and Mikasa head out for the day and Oluo and Gunther make fun of them for doing so. The "old-timers" are going to be there all night. Petra tells them that they call consecutive all-nighters "Beyond the Walls Expeditions" and she expects they will be joining them soon. Sixty percent of all their employees quit within four years due to these expeditions.