We JTECS cannot accept your leave early request unless it is unavoidable reason.
Internship students cannot request such a leave early request to the company without unavoidable reason.
On the first clause of the written pledge which you submitted to the company,
It specifies definitely that
"I follow Japan laws, regulations and the company’s office regulations and other rules firmly".
and you signed.
Please retract your request if no unavoidable reason.