Gather all the ingredients on your countertop.
Julienne the cucumber and place it in a large mixing bowl.
Grate the carrot and add it to the bowl with the cucumber.
Slice the kani into bite-sized pieces and add to the bowl.
In a separate small bowl, combine mayonnaise, rice vinegar, and sesame oil.
Whisk the dressing until smooth and well-combined.
Pour the dressing over the vegetable and kani mixture.
Toss the ingredients gently until everything is evenly coated.
Season with salt and pepper to taste.
Transfer the salad to a serving plate and garnish with green onions and sesame seeds.