Question 1

Where is Kachidoki Bridge?

Accepted Answer

Kachidoki Bridge is in Chuo, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Horimiya: The Missing Pieces does Kachidoki Bridge appear in?

Accepted Answer

Kachidoki Bridge appears in OP of Horimiya: The Missing Pieces.

Question 3

Can I visit Kachidoki Bridge?

Accepted Answer

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

Question 4

Where was Horimiya: The Missing Pieces filmed?

Accepted Answer

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