mochizuki riku, serika (blue archive), serika (swimsuit) (blue archive), blue archive, commentary, highres, 1girl, animal ear fluff, animal ears, ass, barefoot, bikini, blue bikini, blue hair, blue ribbon, cat ears, cat girl, closed mouth, hair ribbon, halo, halterneck, long hair, looking at viewer, official alternate costume, pink eyes, pink halo, ribbon, ruffle bikini, simple background, sitting, soles, solo, swimsuit, toes, twintails, very long hair, wariza