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The "Maxi-Single" thing is pretty controversial on the japanese music industry, some of Ayu "longer" singles, as A were even considered to be albums by both RIAJ and Oricon due to their number of tracks.
They most likelly named it Mini-album because this is how they should name something with this amount of tracks... Even if it was named a single, Oricon would put it on the album ranking anyway.
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