Question 1

Where is Seia Material Corporation?

Accepted Answer

Seia Material Corporation is in Mitoyo, Kagawa, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Yuki Yuna is a Hero does Seia Material Corporation appear in?

Accepted Answer

Seia Material Corporation appears in EP9 of Yuki Yuna is a Hero.

Question 3

Can I visit Seia Material Corporation?

Accepted Answer

Yes. Seia Material Corporation is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Yuki Yuna is a Hero filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Seia Material Corporation is one of those real places (EP9).