"Liberation Maiden (解放少女 Kaihō Shōjo?) is Goichi Suda's contribution to Guild01. In this shooter game, an invading country is stealing all of Japan's energy. The player controls Shoko Ōzora (voiced by Kana Hanazawa), a high school girl who became President of Japan after her father's assassination, as she enters the mech Kaihoki to fight back. It features animated cutscenes created by Studio BONES and the main theme song, "Day of Liberation" (解放の日 Kaihō no Hi?), performed by Marina. The game was released in Europe on October 4, 2012, in North America on October 25, 2012 and individually in Japan on November 14, 2012. The game was later released internationally on iOS on March 7, 2013."
Source: Wikipedia, "Guild01", available under the CC-BY-SA License.