More about Japanese long vowels
い after Kana that end with "e" (i.e. え、け、せ) can be treated as long vowels. For example, せい, めい and れい can be pronounced as long せ, long め and long れ respectively.
On the other hand, う after Kana that end with "o" (i.e. こ、そ、と) can be treated as long vowels too. So こう, そう and とう are pronounced as long こ, long そ and long と respectively.
How to write:
The stroke order illustrations are made by D.328, used under CCSA3.0.