<p>The information were gathered using hacked cameras, mostly in cellphones. The hacked network was that great, that he could get information of nearly anything in Tokyo, and he never stopped that network.</p>

<p>Funfact:  </p>

<blockquote>
  <p>In one of Q&amp;A column, it is revealed that the book was actually blank- All the information lies within Hiruma's brain, and the book only serves as a threat tool.</p>
</blockquote>

<p>Source: <a href="http://eyeshield21.wikia.com/wiki/Book_of_Threats" rel="nofollow">Eyeshield 21 Wiki</a></p>

CC BY-SA 3.0
2013-02-07T13:42:52.127Z
2013-02-07T13:42:52.127Z
looper
<p>Whenever Hiruma wants somebody to do something for him, he pulls out his little black book full of black mail material which has information on seemingly everybody.</p>

<p>I know he started the book to get approval to start the American Football club but is it ever explained how or where he gets all this information?  He seems to have dirt on pretty much everybody in Japan.</p>

<eyeshield-21>
How does Hiruma get all the information in his black book?
# How does Hiruma get all the information in his black book?
Posted by: username_0 on 2013-02-07
Whenever Hiruma wants somebody to do something for him, he pulls out his little black book full of black mail material which has information on seemingly everybody.

I know he started the book to get approval to start the American Football club but is it ever explained how or where he gets all this information? He seems to have dirt on pretty much everybody in Japan.
**Tags:** eyeshield-21
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## 1 answers
### Answer by username_1 on 2013-02-07. Score: 3 | Accepted answer
The information were gathered using hacked cameras, mostly in cellphones. The hacked network was that great, that he could get information of nearly anything in Tokyo, and he never stopped that network.

Funfact:

> In one of Q&A column, it is revealed that the book was actually blank- All the information lies within Hiruma's brain, and the book only serves as a threat tool.

Source: [Eyeshield 21 Wiki](http://eyeshield21.wikia.com/wiki/Book_of_Threats)
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