2boys alternate_costume artist_name balloon banner belt black_belt black_footwear black_hair blue_hair box cake cake_slice cape colored_inner_hair confetti copyright_name crop_top ear_piercing flower food fork frills fruit gift gift_box green_cape green_eyes green_hair green_lips green_shirt hanabatake_chaika hanabatake_chaika_(1st_costume) hanabatake_chaika_(2nd_costume) hanabatake_chaika_(3rd_costume) hanabatake_chaika_(4th_costume) hanabatake_chaika_(5th_costume) hanabatake_chaika_(6th_costume) hanabatake_chaika_(young) holding holding_fork holding_plate ikuyoan looking_at_viewer military_uniform mole mole_under_mouth multicolored_hair multiple_boys navel necktie nijisanji official_alternate_costume official_art orange_necktie piercing pinecone plate red_ribbon ribbon rose sample_watermark shirt short_sleeves shorts smile socks sparkle stomach strawberry striped_clothes striped_socks uniform vertical-striped_clothes vertical-striped_socks virtual_youtuber watermark white_shorts  1boy alcohol alternate_costume alternate_hairstyle artist_name balloon black_hair black_headwear black_jacket black_pants cake champagne champagne_bottle champagne_flute collarbone confetti copyright_name cup drinking_glass elf eyeshadow fedora food gloves gradient_hair green_hair green_lips green_vest hanabatake_chaika hanabatake_chaika_(2nd_costume) hand_on_headwear happy_birthday hat helmet holding holding_helmet ikuyoan jacket lipstick long_sleeves looking_at_viewer makeup multicolored_hair nijisanji official_alternate_costume official_alternate_hairstyle official_art open_clothes open_jacket pants pectorals pointy_ears sample_watermark smile solo standing table vest virtual_youtuber watermark white_gloves yellow_eyes