79542
The main characters ( Aki and Sora ) are similar in appearance to the incestuous characters ( Keisuke and his unnamed sister ) from earlier hentai manga " A Wish of My Sister " by the same author .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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