mochizuki riku, serika (blue archive), blue archive, commentary, unfinished, 1girl, alternate costume, animal ear fluff, animal ears, black cape, black hair, black hat, bloomers, boots, brown boots, cape, cat ears, cat girl, center frills, frills, full moon, halloween, halo, hat, long hair, long sleeves, looking at viewer, moon, open mouth, pink eyes, pink halo, shirt, socks, solo, twintails, underwear, white bloomers, white shirt, white socks, witch hat