Flood
A tsunami together with another tsunami is going to cause a massive flood.
More than one tsunami will definitely result in a flood. Imagine the floody aftermath of more than one tsunami, arriving together.
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After the terrible flood, Emperor こういち comes to survey the destruction and offer hope to his people. But, instead he just tells the people that this flood happened because they didn't believe in the Crabigator's words, and because they weren't doing their kanji reviews.
"This flood was caused by you! It is because you did not believe in the holy Crabigator! It is because you didn't do your kanji reviews. You have sinned, sinned, sinned!" こういち says to the scared, cold, now homeless people.