Share article "Tomorrow's Door" was I WiSH's debut single released in 2003. It became a theme song for the popular TV program "Ainori" at the time, and it caused a huge boom. After that, it was used as the original song in Ai Kawashima's solo career... Continue reading [Free sheet music with do-re-mi] On the Day of Departure (Ai Kawashima) / Door to Tomorrow 3 sheet music by difficulty level