Question 1

Where is 7-Eleven?

Accepted Answer

You can see the exact position of 7-Eleven from the map coordinates and the Street View link.

Question 2

Which scene of Clannad does 7-Eleven appear in?

Accepted Answer

7-Eleven appears in EP2 of Clannad.

Question 3

Can I visit 7-Eleven?

Accepted Answer

Yes. 7-Eleven 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 7-Eleven is one of those real places (EP2).