A child goes to a cram school using the municipal subway. Is it possible to make a commuter pass to go to the cram school?

You can do it.
If you go to a school where you can purchase a commuter pass for City of Yokohama, Transportation Bureau, go to a school where you can purchase a commuter pass, or go to a school where you can teach academic skills to prepare for the entrance examination or to supplement the education of students at a certified school.
Due to City of Yokohama, Transportation Bureau's unique system, only magnetic commuter passes will be sold.
In addition, only municipal subways can be purchased, and commuter passes with other railways are not sold.

Fill out the “Student Certificate of Enrollment” at the study school, and along with documents (student ID, school certificate, etc.) that show that you are attending the school where the commuter pass is issued, the station office Please bring it to the office.
Please download the "Study School Enrollment Certificate" from the link below.
Study school enrollment certificate (Word) (word: 33KB)
Study school enrollment certificate (PDF) (PDF: 82KB)

You can only purchase the section of the municipal subway from the nearest station to your home to the nearest station of the cram school.
It cannot be purchased in conjunction with the section to go to school.

Municipal Subway Commuter Pass