Okey dokey! Lemme give this a try:

Food

1) Sushi--yes
2) Natto--hell no!
3) Hijiki--no
4) Oden--yes
5) Tofu--double hell no!
6) Umeboshi--no
7) Takuan--no
8) Fried fish--yes!
9) Whale--no
10) Miso soup--yes

total=4

Etiquette

Do you :

1) remove your shoes before entering your own house--no
2) slurp your ramen--hell yeah!
3) excuse yourself all the time even when you are not wrong--yes
4) bow (even slightly) when greeting or seeing someone off (in formal situations)--no
5) bow when you talk on the phone--no
6) buy omiyage for your colleagues, friends or family when you go somewhere (even for a few days)--no
7) nod or make little sounds agreement showing that you are listenning to someone--yes
8) avoid teling people directly what you think--yes
9) avoid putting soap or foam in your bath--no
10) refrain from eating in the street or while standing/walking--no

total=4

Cultural adaptation

Can you :

1) Sleep on a futon--yes
2) bear Japanese TV programmes--yes
3) ride a bicycle with an umbrella in one hand--yes
4) sit in "seiza"--no

total=3

Do you :

5) like J-pop--yes
6) like kabuki--no
7) read manga--hell yeah!
8) like sumo--yes
9) like everything that is cute--yes
10) like "onsen" (hot spring)--yes

total=5

GRAND TOTAL=16

So, what do I win?