You are a student and signed a labor agreement,. Actually, the relationship between you and Pizza Hut is just that you provide labor there and he pays you, there is no personnel relationship between you, all your personnel relations are at the school. The following answers to specific questions:
1, the student status to leave does not require any formalities, you write a written separation material on it, as for the manager to approve or not approved do not matter.
2, the manager does not agree that you can also leave, because you signed a labor agreement with the enterprise does not involve personnel matters, such as social security, files. You have the right to not provide labor at any time, and the business has the right to not use you at any time.
3, after reading the previous explanation estimates that you also understand the answer to this question. Since you signed a labor agreement, so you forced not to do nothing affected. In fact, there is no reason why Pizza Hut should not use you, and they are not liable for anything.
Lastly, the manager will not let you leave the reason, Pizza Hut on the employee's turnover rate is assessed, you just do half a year not to do the manager's recruitment is a failure, so the manager will use a variety of ways to keep you.
There is also the case if the disagreement, your restaurant manager will give you to do the time to leave with a list of non-recruitment, which is in the Yum all restaurant database, and then go to Pizza Hut KFC will be more difficult to work.