riku (rrr gns), furina (genshin impact), genshin impact, highres, 1girl, alternate costume, bag, blue eyes, blue hair, blue sailor collar, blue skirt, cardigan, cowlick, cup, day, disposable cup, drop-shaped pupils, grey cardigan, heterochromia, light particles, looking at viewer, open mouth, sailor collar, school bag, school uniform, short hair, skirt, solo, symbol-shaped pupils, thighhighs, thighs, white thighhighs