Life as a person with celiac, suggestions -tokyo

Hello. I have celiac disease and so far I’ve been living off a limited “safe” options here. I’d really like to expand what I can eat. I’m hoping to hear from people who also struggle with this in Japan, or practical suggestions that could genuinely make my life easier.
Main things I'm looking for are:
1. Restaurants that can be made safe / common chain places other than gluten-free specified and sushi.
2. Everyday groceries (stores + easy to find items)
Is there a single supermarket or chain that carries the most gluten-free basics (GF pasta, GF soy sauce, gluten-free snacks), so I don’t need to visit 4 different places? Also, I'd appreciate specific items suggestions. I’m especially worried about soy sauce, mentsuyu, curry roux, and other bottled sauces.
3. Gluten-free options in Kombini
Other than onigiri, soyjoy, and boiled eggs:))

Thank u in advance:))

by NoMomINeedDrugs