1girl armband ayane_(blue_archive) azisai balloon bean_bag_chair black_footwear black_hair black_jacket black_skirt black_socks blue_archive blush braid closed_mouth confetti crown_braid glasses hair_ornament halo happy_birthday heart_balloon highres jacket kneehighs loafers long_sleeves looking_at_viewer miniskirt open_clothes open_jacket pointy_ears red-framed_eyewear semi-rimless_eyewear shirt shoes short_hair sidelocks sitting skirt smile socks solo sweater sweater_vest white_background white_shirt yellow_sweater