I think because being an elder sister of a J-pop group doesn't really count as a valid reason for us to make an entry for them, especially since we even lack ways to associate artist with artists. However, as both HKT48 and AKB48 seem to have a credit in our database, that'd be the reason (and I actually like to see some mainstream artists appear in our website, since their involvement in game or anime can be a noteworthy trivia).
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