God I hope you didn't end up bothering with Chen Kenichi's restaurant. The most overhyped restaurant i've ever been to. Plus you dont have to go all the way to Roppongi as he's got a branch in Shibuya at the Cerulean Tower hotel which has the same menu... He never cooks at his own restaurants from what i've seen and heard (asked the staff).
Also the food is shit and way overpriced. 3,000 + yen for Ma po tofu.... WTF and you dont even get rice included.