Overnight
The tsunami that is white is the most scary tsunami of all. It doesn't come in and destroy everything. No, it comes in, goes inside your door, then stays at your place overnight, without even asking!
はく
と
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Your cat walks up to the white tsunami that's staying overnight and decides it doesn't like it, so it hacks (はく) up a hairball on it. Even that doesn't get the tsunami to leave.