The Saga of Tanya the Evil, Vol. 26 (manga)

The battle between the Empire and the Russy Federation begins. Tanya, dispatched to the eastern front, ought to be disrupting the foe's front lines... But instead, she is sighted over Moskova, the enemy capital ? Meanwhile, the Commonwealth, which has been keeping a close on the war waging on the continent, gradually rolls into the war. It's "Volunteer Army" flanks the Empire--Among their ranks is Mary Sue, the child of Colonel Anson Sue Will Tanya at last meet her magical match?