Millie/Synopsis

History
Millie has a boyfriend who she wears short skirts for, stating that he loves when she wears them. They break up at some point before the State Security Service arrest Jim Hayward at Berlint City Hall.

Introduction Arc
During their break, she gossips with Camilla and Sharon about the recent robbery at City Hall but moves on to complain about their section chief ogling her that morning, which creeps her out more than the robbery.

At Camilla's party, Millie and the girls mock Yor for coming without a boyfriend, and Millie suggests reporting her to the Secret Police for lying. However, everyone at the party is stunned when Loid Forger arrives and introduces himself as Yor's husband.

Secret Police Arc
Millie retells Jim Hayward's arrest by the SSS that morning to her co-workers. She complains loudly, wishing it was their section chief who was arrested instead, just as the chief walks by. When Camilla asks about Yor not telling Yuri about her marriage, Millie wonders why Yor's marriage is such a mystery. She asks Yor if her brother is attractive and to be introduced to him, revealing she broke up with her boyfriend the other day when Sharon reminds her. When seeing the picture of Yor and Yuri, she excitedly describes him as cute but is put off when she realizes Yuri has a sister complex.

Midterm Exams Arc
Millie invites Camilla for a drink but is rejected as Camilla is going to teach Yor cooking that night. Three days earlier, when Yor requested their help in learning how to cook, she offered to teach Yor how to use a can opener.

Cruise Adventure Arc
Returning from their lunch break, Camilla notices Yor in high spirits. Millie asks if Loid bought her something nice, but Yor says no, and the two get annoyed at Yor for having such a nice time. Sharon digs at Yor, saying she is probably happy now that she is somewhat normal. Yor gets excited by the jab, which startles her co-workers.

After work, Camilla, Millie, and Sharon go to a pub and talk about Yor's work trip on a cruise. Millie wishes she got to go, but Sharon and Camilla clarify that Yor is there for work to help with a VIP. A jealous Millie wonders if they are eating fancy food on the ship right now, while Sharon and Camilla are satisfied with their after-work beer and sausages.

Mole Hunt Arc
Millie and Camilla get stuck working overtime but are assisted by Yor and Sharon. After work, Sharon invites Yor to have dinner with them for the first time, to Mille and Camilla's surprise, although they let her join them as well. At the restaurant, Millie pushes for Yor to have a round with them, and they are all surprised when Yor gets drunk afterward. She and Camilla pry for any gossip about Yor and Loid's marriage, demanding any gripes she has about him. As Yor thinks, she cannot find anything and asks if having gripes about your partner is normal.

Millie and the others agree, listing the peeves they have with their partners and how it makes them want to kill them. Yor tries to fit in by lying about stuff she hates about Loid, but her co-workers easily see through the ruse. Yor then downs a glass and picks up a butter knife, telling her co-workers that she will be back. Yor almost leaves the restaurant before rushing back to them and crying that she cannot kill Loid, which Sharon and the others find amusing.

The ladies accept that Yor has a "lovey-dovey" marriage and tease her about kissing Loid and getting intimate with him. In response, Yor pouts in embarrassment, which they all find adorable. Sharon tells Yor that a welcome home kiss is normal, and Millie and Camilla agree, but Yor is shocked by this revelation. After their dinner, Yor and her co-workers part ways, and the three wonder if Yor will actually kiss Loid when she gets home. They then discuss how they enjoyed hanging out with her and agree to invite her out again.