Question 1

Where is Aqua Athletic?

Accepted Answer

Aqua Athletic is in Yamanashi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of mono does Aqua Athletic appear in?

Accepted Answer

Aqua Athletic appears in OP of mono.

Question 3

Can I visit Aqua Athletic?

Accepted Answer

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

Question 4

Where was mono filmed?

Accepted Answer

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