I am a moslem. and for any other moslem people out there that might wanted to spend a great time in japan. Yes you need to eat do you?
As for reading the description of the food ingredients might be difficult.
Do you know any?
for quick bite there is Star Kebab, which has few store in Akiba, quite tasty turkish kebab 500~600 yen http://www.kebab.co.jp/akibamap_en.html http://bfy.tw/3Qk6
SIDDIQUE AKIHABARACURRY-KAN http://www.veg-travel.com/#!e-siddiqu...
Akihabara & Ueno Restaurants: Veggie Vegan Halal http://japanistas.com/en/archives/27200
I cannot give any specific addressed, but from what I hear there are more halal restaurants in Japan. I watch NHK World which is a Japanese government media that is available in English in other countries and they advertise that tourist industry in Japan is trying to me very muslim friendly.