Spajiro is notable for its almost endlessly customizable pastas - there are some fifty different basic variations in tomato-based, cream-based and shoyu-based (Japanese-style) sauces. On top of that you can choose from twenty-five optional add-on ingredients (try the toasted garlic!) and four portion sizes.
The big selection of Japanese-style pastas is especially recommended. Showcasing ingredients like asari clams, natto and mentaiko (spicy cod roe), the pastas are true to tradition but somehow a bit more modern in feel than other Japanese pastas around town.
If you'd like to make a full meal of it, there are good Italian side dishes like arancini rice balls and garlic-sauteed spinach to supplement your noodles. Pasta bowls start at under Y1000, and drinks and side dishes are reasonably priced.
This book will introduce you to more than twenty of Japan's favorite specialty foods that are less well known abroad, along with a guide to the best places in Tokyo to try them and expert tips on what to order. From Bento.com.