1girl, arms_under_breasts, black_panties, breast_hold, breasts, cleavage, collarbone, hair_spread_out, hololive, hololive_english, koupi_(ku_roiko), ku_roiko, large_breasts, legs_up, looking_at_viewer, lying, on_back, panties, partially_undressed, personification, purple_eyes, purple_hair, simple_background, smile, solo, takodachi_(ninomae_ina'nis), thighs, underwear, underwear_only, upside-down, virtual_youtuber, white_background