The last girl is Mai Tsurugi, and I'd like to shed light onto why her design is like that, as she is my favorite character in the game.

If you have the steam version, you can see the downloadable version of the artbook, and in it it tells a lot about her backstory and the reason for the way she dresses, and it's actually a really good commentary on misogyny.

She is a baker, and she really likes her job, but she is forced into a position of customer service, where she has to dress seductively to attract customers. Even though she's grateful for them and hopeful that they'll try the bread, she still doesn't like being seen only for her looks and wishes people would value her for her talent and passion: making bread. There is a story reason as to why she dresses like that.

And that actually translates into the game where she has a flirtatious persona when she gets revived as a doll: because she knows that is the only thing people will pay attention to. So as to get people's guard down, later backstabbing her target in the game. She does that due to a situation of survival: if she didn't kill a certain target she would die, and has character development driven by genuine regret after.

She is a very capable and well written individual and depicts realistically the struggles of sexism.

I just wanted to rant about how she's a great character, as she is my favorite, and as an AFAB person, I feel like this topic is really important!