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. (Wiki)