Week (Do As Infinity song)

is the ninth single by Do As Infinity, released in 2001.

The B-side, "Tsuredzure Naru Mama ni", is the only studio-recorded song by the guitarist Ryo Owatari, who also wrote the lyrics.

The melody parallels that of song "Yesterday & Today".

It was used as the theme song for the drama Yome wa Mitsuboshi.

This song was included in the band's compilation albums Do the Best and Do the A-side.