This is supposed to be Oichi, sister of Nobunaga (like the one who appears in Musou and Basara). She's tagged as such in Pixiv. Sengoku Jidai enthusiasts might also note the Azai crest on her necklace and that she's holding the sack of beans tied at both ends, a crucial item to a story about her. I haven't dared to add a tag since apparently the other Oichis have the respective series along with their name tags, so I'll leave it to the better judgment of the more notorious members.