A school prefect trained by Matsukage to enforce a strict moral code—one that's almost entirely focused on keeping Anna away from anything even remotely questionable. We're talking basketball hoops and toilet paper rolls here. She's got this whole thing formalized as the "Five Provisions," which basically spells out her job description. Fans often note the ironic loophole built in: Oboro can't actually stop Anna if Anna is the one being lewd or asking for lewd stuff.
Despite her rigid stance on school morality, she's surprisingly willing to flip her interpretation of what counts as "illegal material" if a student pushes back hard enough. It's a weird contradiction that makes her kind of endearing—all that strictness with a crack running through it.
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