Bikkuri Donkey, famously known for its massive size hamburg meals (and its funny name) is one interesting place to eat! If you need protein and lots of it, you've come to the right place. Japan is full of wacky and interesting restaurants and Bikkuri Donkey is definitely a part of the club!
"The Nikudon no Mise" is a hot restaurant in Takadanobaba, Tokyo, for their mountain-like big roast beef don (rice bowl). It is delicious, filling, and also priced reasonably, so they are popular with especially young people, and all meat lovers!
For all meat lovers, there is a very popular restaurant you need to go to in Omotesando, Tokyo. That is "Yoroniku", which is well known for the quality of the meat dishes, including a popular Japanese dish called "yakiniku" (Japanese style BBQ). Here is a guide to read before you make a visit.