Pure
A tsunami that's blue is pure. Some tsunami are other colors, like brown or red because they aren't pure, they'll full of trash and poop and other horrible things. But a blue tsunami is completely pure!
せい, しょう, しん
きよ
し
Seeing this pure blue tsunami inspires you to pull out your glowing blue saber (せい)! As the pure water comes toward you, you take one, long slash!