Monday Michiru Sipiagin (maiden name Mariano, more commonly known as Monday Michiru / MONDAY 満ちる born August 19, 1963) is a Japanese American actress, singer, and songwriter whose music encompasses and fuses a wide variety of genres including jazz, dance, pop, and soul. She is arguably best known for being a pioneer of the acid jazz movement in Japan in the early 1990s yet she has created her own unique style of music that transcends traditional definitions of the aforementioned genres.
Monday was born in Tokyo, Japan to jazz pianist Toshiko Akiyoshi and her then husband, jazz saxophonist Charlie Mariano. At an early age, she expressed an interest in music; she studied modern dance and ballet from age eight, and the classical flute for eight years. It wasn't until she went to the Interlochen Arts Academy that she discovered her true passion of singing.
In 1987, Monday appeared as a lead in the movie Hikaru Onna (Luminous Woman) in which she was credited as Michiru Akiyoshi. Monday's unintentional acting career took off as she won Best New Actress awards from Kinema Junpo, The Japan Academy, and the Yokohama Film Festival. With all this success, Monday became somewhat of a celebrity and could be seen on commercial ads and as a “personality” on several major television networks.