At the 1997 Tokyo Motor Show, Daihatsu exhibited a show model based on the mini-car standard that was extremely well received. It was called the "NAKED". The NAKED was so well received at the 1997 Tokyo Motor Show that Daihatsu decided to release it commercially in 1999, almost as a show model. The NAKED was characterized by a simple, functional interior with exposed steel plates and exterior parts that could be easily removed with screws. This made the NAKED extremely easy to customize, and it became a very popular model among custom car enthusiasts. "NAKED" became a car that is still loved by core users.

In a world where the martial arts using tanks, "Tank Do," is considered a favorite of Yamato Nadeshiko, along with flower arrangement and tea ceremony. A transfer student, Miho Nishizumi, came to Oarai Girls' Academy. Miho hates tank driving and chooses Oarai Girls' School, which does not have tank driving. However, as soon as she transfers, she is summoned by the student council president, who forces her to choose tank driving as a compulsory subject and to participate in the national tank driving competition. Moreover, the members who have gathered together are all unique individuals. They include Isuzu Hana, the daughter of the head of the flower arrangement school, Takebe Saori, who is in love, Akiyama Yuukari, a tank maniac, and Reizei Asako, an honor student who is weak in the morning. Will Miho's modest wish for a normal high school life with her friends come true?

A third-year student at St. Gloriana's College, a strong tank driving school. She is a cute gunner with blond hair and black ribbons. She is data-driven and analytical, but also likes to joke around. Her favorite food is roast beef.