Just by looking at the
English House in Maebashi website, it seems a decent school with extensive support for their students.
Don't know if Robin Kaye (Office Tel: 027-256-7200) is still working there, but you could always drop a line to say "hello".
Working hours are a bit tough though as they require 40 hours a week for only around 250,000 yen per month. Other schools pay this for only 30 hours or less a week. You want to try and get a teaching job where you are only required to teach and not do office hours.
English House in Maebashi are a member of
JAPFLE which is always a good sign, and the fact that they don't want to tarnish their reputation by scamming teachers.
If you are not worried about working the long hours, then I would say give it a go.