I do not recommend this option, however it may be a better option for some of you compared to the online typewriter.
First, this requires that you have the japanese keyboard input set-up. Details can be googled, but it's simply:
and insert japanese (Microsoft IME) from there.
After that, for the sake of this method, configure it (via properties) such that the input method is "Kana input" and not "Romaji Input".
To activate the japanese input, make sure it is selected in the language bar, then click the "A" button and change it from Direct input to Hiragana.
Now the really tough part - learning your new keyboard.
I've been experimenting with this, but your keyboard layout MAY be different from mine: QWERTY. Refer to these screenshots:
The blocks have been color-coded according to the hiragana alphabet sections, but there aren't enough colors for that many distinct blocks
Because of that, I also provided a small text-only chart to the side of the above picture.
Note on the わ／を Key: わ is the normal '0' input, but Shift+0 changes it to を. Shift modifies some other keys too, but only for small script.
The " and ° keys should be self-explanatory - modifying most of the characters to feature those...things - type them after the character in question.
If you choose to proceed with this option, good luck to you, as I can't guarantee the accuracy of the material provided. Simplest way to go about it - keep the screenshot(s) off to the side as reference, whilst you type.
To be honest though, it's probably much much easier to learn the alphabet itself and its romaji, and just use romaji input...