Question 1

Where is Ashigaramon Gate?

Accepted Answer

You can see the exact position of Ashigaramon Gate from the map coordinates and the Street View link.

Question 2

Which scene of Waiting in the Summer does Ashigaramon Gate appear in?

Accepted Answer

Ashigaramon Gate appears in OP1 of Waiting in the Summer.

Question 3

Can I visit Ashigaramon Gate?

Accepted Answer

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

Question 4

Where was Waiting in the Summer filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Ashigaramon Gate is one of those real places (OP1).