Question 1

Where is Toseikomainu?

Accepted Answer

Toseikomainu is in Kan-onji, 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 Toseikomainu appear in?

Accepted Answer

Toseikomainu appears in EP6 of Yuki Yuna is a Hero.

Question 3

Can I visit Toseikomainu?

Accepted Answer

Yes. Toseikomainu 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 Toseikomainu is one of those real places (EP6).