Koharu is a shy girl who likes assembling plastic toys. One day when going home from school she sees a weird plastic toy shop and decides to go inside after being invited by the owner. She finds anew plastic toy called the "Girl Gun Lady" also called "Lady Commander Alice" there paired with "Attack Girl Gun" and decides to buy it since the owner told her that she won't be able to buy it later on and this plastic toy is said to have changed the lives of many people, the owner being one of them. (Source: XieLalisa at MyDramaList)