Question 1

Where is Grand Blue?

Accepted Answer

Grand Blue is in Nagoya, Aichi Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of A Sign of Affection does Grand Blue appear in?

Accepted Answer

Grand Blue appears in EP11 of A Sign of Affection.

Question 3

Can I visit Grand Blue?

Accepted Answer

Yes. Grand Blue is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was A Sign of Affection filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Grand Blue is one of those real places (EP11).