Tide
A small tsunami comes in the morning with the moon. That just means the ocean gets bigger when the moon's out, and that my friends is simply the tide.
The moon does affect the tides a bit, so you can imagine the tsunami as the water getting bigger whenever the moon is out. That's just the tide.
ちょう
しお
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You go check out the tide. The water is coming in a little stronger, and something washes up on the shore. It's a body! You roll the body over and it is Mrs. Chou (ちょう)!
She wakes up and says, "If only you came at low tide then I would never have been saved!" She jumps up and runs off, yelling something about destroying the world.