Mika is the main commander of Jatkosota Girls High School and a very kind and quiet girl who loves playing the kantele. Aki is a short and timid girl who is the vice commander. Mikko is the vice commander of Jatkosota as well and is very energetic and loves having fun with her friends. They are a tank crew for a BT-42 light tank in Senshado and they are having a sleepover because their team won against Saunders University High School in a Senshado match. They are all girls.