mochizuki riku, serika (blue archive), blue archive, commentary request, highres, 1girl, animal ear fluff, animal ears, black buruma, black hair, black shoes, black socks, blue ribbon, blush, breasts, buruma, cat ears, cat girl, dated, hair ribbon, halo, jacket, long hair, long sleeves, looking at viewer, open mouth, pink eyes, pink halo, ribbon, shoes, signature, simple background, sitting, sleeves past wrists, small breasts, sneakers, socks, solo, track jacket, twintails, very long hair, white background