Yes. You can cancel anytime, including the free trial period. If you cancel during the trial period, you will not be charged. For the information on how to cancel, please refer to the article: How do I cancel my subscription?
*The free trial is available to new customers only.
*Free Trial will not be applicable for sign up with only Hulu ticket (pre-paid payment).
*Your free trial period expires upon cancellation and the free trial will not be appropriate for the next sign-up.
*Unfortunately, you cannot access the Hulu Japan service from outside Japan.