Looking for a English classes in for a elementary school kid.

Looking to enroll my 6 year old kid at a English class/ language school, who speaks English at a near native level and attends Japanese elementary school. I was planning to teach him myself, but work commitments keeps pilling up.

A place around Kawasaki Aso-ku, Yokohama Aoba-ku/Tsuzuki-ku,, Inagi city would be ideal.

Was looking at J-prep (but didnt like it since 2.5 hour session seems too much for a small kid) and Lexis Language Center (which is bit far)

Any recommendations?

by nethdeco