You can now buy Halal Baum Kuchen at kiosk stores of Keio Railway stations.
http://www.keio.co.jp/english/index.html
The price is 160 yen. It is manufactured by Taiyosyokuhin CO. LTD and has acquired Halal approval from the Badr in Otsuka.
This is one of the greatest steps for Japan in making a country where people can enjoy Halal food anywhere, since convenience stores and kiosk stores in stations have great importance in living a daily life in Japan.