But when she attends the all-girls Teito Academy (帝都学園, Teitou Gakuen) which is known for its Panzer League, she not only faces very new things as a typical rich girl such as junk food, the lack of servants, and studying in school, but also faces challenges as a panzer, especially her inexperience and small stature.
During a break in training, Doris was challenged by a panzer known as "Raging Beetle", who uses a pair of large hedge trimmers as weapons.
Their first encounter was a disaster as Doris, billed as "Drill Princess", was overwhelmingly routed by Raging Beetle.
Doris's progress as a panzer and Nejiru's rustiness after a long absence figured in that bout, which ended on a draw based on points.
Nejiru was fatally injured while she and Doris were rescuing some construction workers from a collapsing structure using their powers as panzers.