(葛原 みどり, Kuzuhara Midori) is a Gewehr-type Red Kämpfer. Midori is a part of the student council and Shizuku's partner. Midori doesn't like Natsuru for hogging all of Kaede's attention. She was ordered to watch over Shizuku, to keep her from finding out more about the moderators.
Shizuku, in turn exploited Natsuru and Akane to have her sidelined because Kämpfers of the same color can't fight each other.
Midori was armed with two pistols and had Hit-and-Run Hippopotamus as her Messenger.
In the Anime, the already-dead Red Kämpfer Tamiko Shinomiya was the fellow Kämpfer instead of Midori, nevertheless she had the same messenger. However, she is never seen but only mentioned in Episode 8.