This often highlights that the version includes "OVA" (Original Video Animation) content not seen in the televised or shorter versions, or that it is being hosted on a platform with the highest available bit-rate and quality. Availability and Format The series usually consists of two OVA episodes.
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I'm assuming you're referring to the anime and manga series "Shounen Maid" (also known as "Boy Maid") and its main character, Kuro. This often highlights that the version includes "OVA"