Hayacomi

The novel's story begins in 1940, centering on Soviet citizen Serafima, who lives in a small village outside Moscow. She hunts deer together with her mother, and enjoys her friendship with her childhood friend Mikhail. When the Germans invade the Soviet Union, her village is caught up in the offensive, with all her friends and family dying or missing as a result. Saved only by a Red Army force, Serafima joins the Red Army and trains as a scout sniper in an all-female unit of snipers, swearing vengeance on her enemies. (Source: ANN)

Karen is reborn in another world, but she's entirely ordinary—no powers, no special skills, and no grand mission to accomplish. Fortunately, life is easy as a rich noble. Karen lives the good life until her mother completely forgets everything about her. When it's discovered that Karen is actually the child of an affair, she's banished from the family and forced to live on her own as a fourteen-year-old commoner! However, two years later, her family presents her with a chance to rejoin the ranks of the nobility under one condition: she must marry either the elderly, widowed margrave who lives on the frontier, or the dashing soldier who's seemingly destined for greatness. Which will she choose? (Source: J-Novel Club)