There are plenty of Japanese beers to enjoy throughout this movie but I suggest you go to the craft side and try anyone of the Hitachino Nest Beers.* If you have a choice I suggest you try the XH. This beer gives you the best of Japanese drink culture. The XH is their interpretation of a brown Belgian ale that was aged in Sake barrels.
* Sapporo would be a perfectly acceptable substitute if you can't find these beers.