P/s: After reading through the tables, do you feel like fainting? That's how I felt when I first learnt. When you get used to the characters, you will just remember it. So, no worries~ =p There are some more characters to learn. *dun faint, k?*

For the ka-, sa-, ta-, ha- lines, you can add two little dots to transform them into new letters!
e.g. �� (ka) add two dots --> �� (ga)
The rest of the letters in the line follow suit.
�� ki --> �� gi
�� ku --> �� gu
�� ke --> �� ge
�� ko --> �� go

�� sa --> �� za
�� shi --> �� ji
�� su --> �� zu
�� se --> �� ze
�� so --> �� zo

�� ta --> �� da
�� chi --> �� ji
�� tsu --> �� zu
�� te --> �� de
�� to --> �� do

�� ha --> �� ba
�� hi --> �� bi
�� fu --> �� bu
�� he --> �� be
�� ho --> �� bo

Other than these, there is yet an additional line for ha-.
e.g. �� (ha) add one circle --> �� (pa)
The rest of the letters in the line follow suit.
�� hi --> �� pi
�� fu --> �� pu
�� he --> �� pe
�� ho --> �� po

Bad news! That's not the end. One more table and we are done with the kana- letters.