find someone who knows what the word "vegan" means (especially in Japan).
Mos, rarely serves anything with eggs, and it's even rarer for him to have anything with meat. The cheese however isn't vegetarian or vegan.
Having said that, there are more options than what you'll be able to find else where and he will custom a pizza for you. The bakery bread is amazing and the atmospher is chill. There is also a room out the back for parties.
Mos can understand a little English if you speak slowly ~
Cons: The cheese isn't vegan.