The Oneamisu sector was a region of space. The Braslota system was located in this sector.

In 2365, the USS Enterprise-D and the USS Hathaway conducted a Starfleet battle simulation in the Braslota system. (TNG: "Peak Performance" okudagram)

Most of the simulation information consisted of in-joke references to Anime (Japanese animation), including The Wings of Honneamise (aka Oneamisu No Tsubasa) for this specific example.
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