Japanese/Kana/Lessons/Hiragana/Lesson 2

In this lesson you are going to learn how to read and write か, き, く, け, こ. Adding two small lines called dakuten, but commonly known simply as  tenten, meaning "two marks", causes clear sounds to change to their voiced sound. Thus, adding the tenten marks will cause か, き, く, け, and こ to produce が, ぎ, ぐ, げ, ご.

Clear Sounds
日语/假名/平假名/第二課