Question 1

Where is Funsui?

Accepted Answer

Funsui is in Toyohashi, Aichi Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Makeine: Too Many Losing Heroines! does Funsui appear in?

Accepted Answer

Funsui appears in OP of Makeine: Too Many Losing Heroines!.

Question 3

Can I visit Funsui?

Accepted Answer

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

Question 4

Where was Makeine: Too Many Losing Heroines! filmed?

Accepted Answer

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