# Hot Hot Hot / Mirrors

"Hot Hot Hot / Mirrors" is the 47th Japanese single by South Korean pop duo Tohoshinki, released on July 31, 2019, by Avex Trax as a single for Tohoshinki's tenth studio album XV (2019). It is a double A-sided single featuring "Hot Hot Hot", a summer-themed pop song; and "Mirrors," a theme song for the 2019 Japanese television drama Sign (サイン―法医学者 柚木貴志の事件).
"Hot Hot Hot" was written by Nicolas Scapa, Michael Hancock, and John Fasses, with lyrics by Kelly. "Mirrors" (ミラーズ) was written by Hi-yunk with lyrics by Tsukiko Nakamura. The accompanying music video for "Hot Hot Hot" was released on July 19, 2019, on YouTube. A one-minute and 29 second special movie for "Mirrors" was uploaded to YouTube on August 23, 2019. Tohoshinki debuted their performance of "Hot Hot Hot" on June 24, 2019, for the FNS Music Festival, where they also performed "Why (Keep Your Head Down)."
The single debuted at number two on the Oricon Singles Chart.

## Background and release

"Hot Hot Hot" and "Mirrors" were announced to be double A-sided singles in early June 2019. Written by Nicolas Scapa, Michael Hancock, John Fasses and Kelly, "Hot Hot Hot" was described to be a fun, summer-loving dance track. "Mirrors" was written by Hi-yunk with lyrics by Tsukiko Nakamura. It was announced to be the theme song of the Japanese television drama Sign—remake of the 2011 South Korean television series of the same name—on June 18. Sign premiered on TV Asahi on July 11, 2019.
On July 1, Tohoshinki revealed album covers for the single, which was announced to be released in three versions: a standard CD single, a limited edition single with a 24-page photobook, and an exclusive version for Tohoshinki's fanclub, Bigeast. The music video for "Hot Hot Hot" premiered on July 19, 2019, one week before the single's official release on July 31, 2019.

## Commercial performance

"Hot Hot Hot" entered the Billboard Japan Hot 100 at number 56. It rose to number four on its second week, while "Mirrors" peaked at number 46. "Hot Hot Hot" entered the Billboard Japan Download Songs chart at number 33, while "Mirrors" entered the chart at number 53. The single debuted at number three on the Billboard Top Single Sales. "Hot Hot Hot" entered the CDTV's Countdown Weekly chart at number three.
According to the Oricon, "Hot Hot Hot / Mirrors" debuted at number two on the Oricon Singles Chart, selling 59,230 physical copies on its first week. It is Tohoshinki's lowest-selling single since "Purple Line" in 2008.

## Live performances

Tohoshinki debuted their performance of "Hot Hot Hot" at the FNS Music Festival on July 24, 2019. They performed "Hot Hot Hot" a second time for the A-Nation Music Festival on August 18, 2019, in Osaka.

## Charts

| Chart (2019) | Peak position |
| Japan (Oricon Singles Chart) | 2 |
| Billboard Japan Hot 100 | 4 |
| Billboard Top Single Sales | 3 |
| Billboard Japan Download Songs | 33 |

### Sales

| Released | Oricon chart | Peak | Debut sales | Sales total |
| July 31, 2019 | Daily Singles Chart | 2 | — | 64,878 |
| July 31, 2019 | Weekly Singles Chart | 2 | 59,230 | 64,878 |
| July 31, 2019 | Monthly Singles Chart (July) | 10 | 64,878 | 64,878 |
| July 31, 2019 | Yearly Singles Chart (2019) | TBA | TBA | 64,878 |

## Release history

| Region | Date | Format | Label |
| Worldwide | July 31, 2019 | Digital download on iTunes Store | Avex Entertainment |
| Japan | July 31, 2019 | CD digital download | Avex Trax |
| South Korea | August 19, 2019 | Digital download | S.M. Entertainment |
| Taiwan | August 21, 2019 | Digital download | Avex Taiwan |