The anime personifies the Hacka Doll app's customization engine as three "Hacka Dolls" — the personal entertainment AI and main navigator Hacka Doll #1, the anime expert Hacka Doll #2, and the knowledgeable otaku Hacka Doll #3.
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(Source: Anime News Network)

Hacka Doll app delivers a customized feed of news for each user. The user answers some simple questions when launching the app for the first time, and then the app will filter the news that caters to the user's personal interests. With daily use, the app automatically analyzes and learns which news articles the user reads and recommends to further personalize the feed. The anime personifies the app's customization engine as three "Hacka Dolls"—the personal entertainment AI and main navigator Hacka Doll #1, the anime expert Hacka Doll #2, and the knowledgeable otaku Hacka Doll #3.
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Source: ANN

In the year 2xxx, development of information are going so fast, humans being are drowning in the sea information. This leads to a situation where people can not find the necessary information. The only hope to solve this problem is the navigator program, Hacka Doll.

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