029 1girl anniversary black_wings blue_archive blush cake closed_mouth feathered_wings food full_body hair_between_eyes halftone halftone_background halo hat head_wings horns jacket koharu_(blue_archive) long_hair long_sleeves looking_at_viewer loose_socks low_wings multicolored_hair multiple_wings off_shoulder official_art pink_hair pleated_skirt purple_eyes red_skirt sailor_collar school_uniform shirt shoes sitting skirt sleeves_past_wrists socks solo tail white_socks wings