Union is the 11th studio album by Chara, which was released on February 28, 2007. It debuted at #4 on the Japanese Oricon album charts, and charted in the top 300 for 8 weeks.

Miwa Watabiki , better known by her stage name Chara (ちゃら), is a Japanese singer, actress and video jockey. She debuted in 1991 with the single Heaven. She is known for her song "Swallowtail Butterfly ", the theme song for the 1996 Shunji Iwai film Swallowtail Butterfly in which she starred, her 1997 hit single "Yasashii Kimochi", and her collaboration with Judy and Mary vocalist Yuki, "Ai no Hi Mittsu Orange". Chara later formed a band with Yuki, called Mean Machine.