Photo taken on Nov. 30, 2020 shows a mask-themed shop during its preview activity in Yokohama, Japan. A mask-themed shop named "mask paradise" selling various mask-related products opened on Tuesday in Yokohama. The shop is expected to open for one month. (Xinhua/Du Xiaoyi)

Photo taken on Nov. 30, 2020 shows a mask-themed shop during its preview activity in Yokohama, Japan. A mask-themed shop named "mask paradise" selling various mask-related products opened on Tuesday in Yokohama. The shop is expected to open for one month. (Xinhua/Du Xiaoyi)

Photo taken on Nov. 30, 2020 shows a mask-themed shop during its preview activity in Yokohama, Japan. A mask-themed shop named "mask paradise" selling various mask-related products opened on Tuesday in Yokohama. The shop is expected to open for one month. (Xinhua/Du Xiaoyi)

A journalist wears a LED mask at a mask-themed shop during its preview activity in Yokohama, Japan, Nov. 30, 2020. A mask-themed shop named "mask paradise" selling various mask-related products opened on Tuesday in Yokohama. The shop is expected to open for one month. (Xinhua/Du Xiaoyi)

Photo taken on Nov. 30, 2020 shows a mask-themed shop during its preview activity in Yokohama, Japan. A mask-themed shop named "mask paradise" selling various mask-related products opened on Tuesday in Yokohama. The shop is expected to open for one month. (Xinhua/Du Xiaoyi)