She heads Team C which is composed of Reki-jo (History Buffs), which is also called "Hippo Team." Her team operates a Sturmgeschütz III or more commonly called "StuG III."

It is suggested that her name "Erwin" is a reference to Field Marshal Erwin Rommel, a German general during WWII.

She is really into the history of Europe, especially Germany. She's personally biased towards World War II.

She serves as the team's commander and radio operator.