Question 1

Where is On Hair?

Accepted Answer

On Hair is in Nagoya, Aichi, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of A Sign of Affection does On Hair appear in?

Accepted Answer

On Hair appears in EP4 of A Sign of Affection.

Question 3

Can I visit On Hair?

Accepted Answer

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

Question 4

Where was A Sign of Affection filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and On Hair is one of those real places (EP4).