"Week!" 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 article does not cite any sources. (March 2014)

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

1. "Week!"
2. "Tsurezure Naru Mama ni" (徒然なるままに, With Tedium And Boredom At My Side)
3. "Week!" (Instrumental)
4. "Tsurezure Naru Mama ni" (徒然なるままに, With Tedium And Boredom At My Side) (Instrumental)

• "Week!" at Avex Network
• "Week!" at Oricon

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