"Stand by U" is South Korean pop group Tohoshinki's twenty-eighth Japanese language single.

[1][2] Upon the release of the single in Japan, it took the number two spot on the Oricon daily chart selling over 94,800 copies.

[5] On the issue date of July 13, 2009, "Stand by U" debuted at number two on the Oricon weekly chart behind pop boy band Arashi's "Everything"; selling a little more than 182,060 copies.

[6][7] Like their twenty-third Japanese single, "Dōshite Kimi o Suki ni Natte Shimattandarō?

[8][9] As the song was used as the theme song for Japanese mobile drama Sweet Room, the music video features the characters of the first story Last Love starring Narimiya Hiroki as the male lead and Yukari Shiomi as the female lead.