One of Tokyo's last handmade umbrella shops has weathered many storms and is now thriving, thanks to booming demand for parasols as Japanese summers get hotter, with demand from men also increasing.

"You'll feel cool under a parasol. ... Once you use it, you can't let go," promised Hiroyuki Komiya, the owner of Komiya Shoten, on a recent sweltering day.

The 54-year-old's grandfather started the business 93 years ago.