鬼怒川カスミ(happy birthday)

character: kasumi_(blue_archive), birthday celebration, holding a decorated birthday cake with lit candles, wearing white lab coat over red shirt and black shorts, joyful mischievous expression with yellow eyes gleaming, long black hair with hair intakes and ahoge flowing, black demon horns and black tail visible, surrounded by colorful balloons and confetti, warm party lighting with onsen steam effect in background, festive atmosphere, happy birthday vibes, playful composition, anime illustration, great quality, best quality