1girl arm_behind_head arm_up bangs black_headwear blue_archive blush book breasts cellphone coat coat_removed collarbone completely_nude crossed_legs hair_between_eyes halo hat highres holding holding_phone indoors iroha_(blue_archive) long_hair looking_at_viewer lying navel nipples nude on_back open_mouth peaked_cap phone purple_eyes red_hair shimokirin small_breasts smartphone solo thighs very_long_hair wavy_hair