J.C.Staff Co., Ltd. is a Japanese animation studio founded in January 1986 by Tomoyuki Miyata, who previously worked at Tatsunoko Production. The studio's first release was Yōtōden in 1987. From Wikipedia
Fans are growing uneasy after J.C. Staff’s quiet lead-up, unrecorded voice sessions and manga redraw hold-ups ahead of the fall return.