In 11 941 AD, units 2 and 4 infiltrate the elevator leading to the main enemy server at the top of Mount Ka'ala, in order to take back the Earth to the mechanical life forms. Accompanied by Rose and Gerbera, members of the resistance, they face two mechanical life forms to the appearance of little girls, in the room of the server at level 12. On the orbital basis, all question themselves about the support of the YoRha troops. What is the real objective of the YoRha project decreed by the Council of Humanity? What is the purpose of this operation, which the two girls machines seem to know about the ins and outs of it? What will be the outcome of this battle against mechanical life forms?