From AKABANE station Take TAKASAKI SEN line North toward TAKASAKI. The train also stops at IKEBUKURO and SHINJUKU, though less often. Get off at HONJO Station (about an hour and a half, around 1600 yen).
Then take a BUS from HONJO station: Walk out ticket gate. Go RIGHT. walk down the stairs. There are three bus stops. Go to the stop on the far RIGHT, in front of the 7-Eleven. Last bus is at 8:15pm weekend, 9pm. weekday. Take bus to ONISHI YUBIN KYOKU MAE 鬼石郵便局前. (40 minutes, 640 yen)
Walk toward the stoplight. Turn RIGHT at corner. Walk about 1 minute. Shiro Oni studio is on your right. (3 minutes)