Question about literacy programs in the major eikaiwa chains

Hi all,

I'm developing an English literacy program based on the principles of Orton Gillingham localized for Japanese children (specifically the pronunciation instruction addresses the most common issues for native Japanese speakers). I'm part of a bicultural family and am raising bilingual half Japanese sons, but I haven't taught in Japan (though I did live there for a year and a half when my son was a baby). I was hoping I could get some insight on what the major eikaiwa chains are using for their literacy instruction. Is Jolly Phonics used extensively? Anything else?

Thanks a lot!

Devon