Hiroki Moriuchi (森内 寛樹, Moriuchi Hiroki) (born January 25, 1994, in Tokyo), better known professionally as Hiro, is a Japanese singer and the lead vocalist of the Japanese rock band My First Story.

[6] Hiro announced his marriage to actress and model Maika Yamamoto on October 13, 2024, through a post in his official social media account.

[3] He is currently active as the lead vocalist of the Japanese rock band, My First Story, which was formed in Shibuya in 2011.

[8] He released his solo debut album Sing;est on January 20, 2021, through Universal Music Japan.

It contains ten covers of songs originally performed by exclusively female vocalists.