1girl, aqua_eyes, aqua_hair, armpits, arona_(blue_archive), bare_shoulders, bed_sheet, bikini, black_bikini, blue_archive, blunt_bangs, braid, collarbone, eyes_visible_through_hair, frilled_bikini, frills, from_above, halo, lettu, looking_at_viewer, looking_up, lying, multicolored_hair, navel, official_alternate_costume, on_back, outstretched_arms, short_hair, short_sleeves, sidelocks, single_braid, solo, spaghetti_strap, spread_arms, spread_legs, stomach, swimsuit, two-tone_hair