(SPOILER EDITION) Descent of the Durtle into Madness

WaniKani
11
The first three keywords (not necessarily in order)

As @Belthazar mentioned, there are a bunch of ISBN numbers and other numbers.

The other numbers are a page number and a list of character numbers.

I’ve decoded words in the following three books:

Genki 1
Genki 1 Workbook
A Dictionary of Basic Japanese Grammar.

The three keywords are:

  • Turtle
  • eating
  • unko (<–Japanese for poop)

Here’s the example for unko (assuming I did it right. The other 2 keywords were easier)

Clue:
<!-- 9784789014410 89 41 3 12 31 -->

9784789014410 is the ISBN number for the Genki 1 Workbook (2nd edition)
Page 89 has the following text.  I've removed all spaces and punctuation:

         1         2         3         4         5         6         7         8
1234567890123456789012345678901234567890123456789012345678901234567890123456789012345
KenandMichikoaretalkingListentothedialogueandanswerthequestionsinJapanese

Choosing the 41st, 3rd, 12th, and 31st letters gives you:

unko
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