arch a4, mika (blue archive), blue archive, absurdres, commentary request, highres, 1girl, alternate costume, armpits, bell, black choker, black garter straps, black thighhighs, blood, blood in hair, blood on clothes, blood on face, blood on hands, blush, box, breasts, choker, cleavage, crazy smile, detached sleeves, doorway, dress, empty eyes, garter straps, gift, gift box, hair bun, halo, hat, heart, holding, holding knife, kitchen knife, knife, large breasts, long hair, looking at viewer, neck bell, pink hair, pov, pov doorway, red dress, reverse grip, santa costume, santa hat, single side bun, smile, solo, strapless, strapless dress, thighhighs, very long hair, yandere, zettai ryouiki