Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 1 1/2-quart casserole dish.
Bring a large pot of lightly salted water to a boil; cook rotini at a boil until tender yet firm to the bite, about 8 minutes. Drain and transfer to a large bowl.
Add condensed soup, Cheddar cheese, imitation crab, milk, seafood seasoning, Cajun seasoning, and pepper to rotini; mix ingredients together. Transfer to the prepared casserole dish.
Mix bread crumbs and melted butter in a small bowl until crumbs are moist; spread evenly over the casserole mixture.
Cook in the preheated oven until bubbly and topping is golden brown, about 30 minutes.
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