She became interested in acting while in junior high school, when her older sister Hitomi started working as an extra on TV shows.
She made her acting debut in 1998 in the leading role of Hideaki Anno's Love & Pop.
The movie's theme song "Ano Subarashii Ai wo Mou Ichido" was sung by Miwa and released as a single on December 22, 1997.
[2] For her performance in Love & Pop, she won the Best New Talent award at the 20th Yokohama Film Festival in 1999.
She provided the motion capture for the character Rebecca Chambers in the ending movie of the 2002 video game Resident Evil Zero.