Question 1

Where is Cosmo Clock 21?

Accepted Answer

Cosmo Clock 21 is in Yokohama, Kanagawa Prefecture, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of You and I Are Polar Opposites does Cosmo Clock 21 appear in?

Accepted Answer

Cosmo Clock 21 appears in EP12 of You and I Are Polar Opposites.

Question 3

Can I visit Cosmo Clock 21?

Accepted Answer

Yes. Cosmo Clock 21 is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was You and I Are Polar Opposites filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Cosmo Clock 21 is one of those real places (EP12).