Question 1

Where is NTT East Mizuho Telephone Switchboard?

Accepted Answer

NTT East Mizuho Telephone Switchboard is in Hinohara, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Clannad does NTT East Mizuho Telephone Switchboard appear in?

Accepted Answer

NTT East Mizuho Telephone Switchboard appears in OP1 of Clannad.

Question 3

Can I visit NTT East Mizuho Telephone Switchboard?

Accepted Answer

Yes. NTT East Mizuho Telephone Switchboard is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Clannad filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and NTT East Mizuho Telephone Switchboard is one of those real places (OP1).