James Mortimer 23.Sep.2012Getty Images
Williams has played three games for the Japanese club, sitting out the first, and while he set up a try in his second game, the biggest roar of his time in Asia came as he crossed the line early in the first half, which allowed Panasonic at the time to draw level with their great rivals.
In front of 12,300 fans at Tokyo's Prince Chichibu Memorial Rugby Ground, Williams didn't cut a happy figure after losing his second match in three games for Panasonic.
"It's always disappointing when you lose," he said.
"It was good to get across the try line but I was really disappointed and frustrated at the end.
"Toshiba played a forwards game and played well. We just have to be smarter. We let in some soft tries and have to go back to the drawing board and listen to the coaches."
Suntory and Toshiba both remain undefeated and on top of the table.