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Mai-Otome and Sora No Woto are series that deal with a war type of situation with all of the characters wanting peace. Both series have a comedic aspect to them, however, the underlying threat of a war is always looming overhead.
The Nation of Gallia has always remained neutral in conflicts and has only gone to war to defend itself. However, as war flares between the East Europan Imperial Alliance and the Atlantic Federation, Gallia is soon targeted for its abundance of ragnite ore, a versatile and hugely valuable material. The Civilian Militia is soon called into action, and Welkin Gunther - son of a legendary war hero - is named leader of Squad 7. Under his command are the headstrong and practical Alicia Melchiott; the sharp-tongued Brigitte Stark; the grizzled veteran, Largo Potter; and Welkin's adopted sister Isara, whose Darcsen heritage means she faces prejudice, even from members of her own squad. With the rest of Squad 7 and the mighty tank Edelweiss, they must do their best to defend Gallia.
Sora No Woto and Valkyria Chronicles both deal with the main protagonists having to go through a life and death war type of situation and the implications of what the war has in store for them and the tension involved between the characters.