I wrote decompiler for sec4 & sec5 files, and now need remake of solfa01,solfa02,solfa03,solfa04,solfa05 be Sage circle in 2007 year.
http://www.dlsite.com/maniax/work/=/product_id/RJ027073.html
http://www.dlsite.com/maniax/work/=/product_id/RJ027075.html...