1girl, bare_arms, bed_sheet, between_legs, black_hair, black_shirt, blue_archive, blue_eyes, blush, grey_panties, halo, hand_between_legs, helmet, looking_at_viewer, lying, momoiro_lettuce, navel, on_back, open_mouth, panties, saki_(blue_archive), shirt, short_hair, sleeveless, sleeveless_shirt, solo, underwear