After a performance as Tommy february6 in 2003, Kawase took off her glasses and donned a much more alternative look to create Tommy heavenly6, a brand new character with a modern rock sound. Kawase would later explain that Tommy heavenly6 was born from a dream that Tommy february6 had, in which she extrovertly embraces all the elements of her personality she had previously been repressing. This is reflected in the promotional video for Tommy heavenly6's first single, Wait...

After a performance as Tommy february6 in 2003, Kawase took off her glasses and donned a much more alternative look to create Tommy heavenly6, a brand new character with a modern rock sound. Kawase would later explain that Tommy heavenly6 was born from a dream that Tommy february6 had, in which she extrovertly embraces all the elements of her personality she had previously been repressing. This is reflected in the promotional video for Tommy heavenly6's first single, Wait Till I Can Dream, wherein Tommy february6 drinks from a hip flask and falls asleep, only to be woken by Tommy heavenly6.

Musically, she's the polar opposite of Tommy february6, and possesses an image most people would consider more dangerous, but Kawase claims that Tommy heavenly6 is far more pure and true to her heart than Tommy february6 is. Kawase claims that the invention of Tommy heavenly6 occurred due of her disappointment in Tommy february6's character, but far from being a replacement, Kawase chose to keep the two characters' careers separate. During 2003 and 2004, Tommy heavenly6 released only two singles, whilst Tommy february6 went on to release her second full album, Tommy airline. It would be in August 2005 (nearly exactly two years after her first single) that Tommy heavenly6 would finally release her third single, which was shortly followed by her own long awaited eponymous debut album.

In 2006/2007 Kawase has had a very busy period, releasing five new singles and a new album, Heavy Starry Heavenly as Tommy heavenly6. She finished this productive phase with the Heavy Starry Tour, four live performances as Tommy heavenly6 during March 2007. She incorporated most of her songs into this live format, which lasted for an hour and a half , complete with her now regular backing band, and even her band mates from The Brilliant Green made guest appearances for some songs. On June 1 2007 The Brilliant Green announced they would be returning with new material. Kawase has since continued Tommy heavenly6's career, releasing "PAPERMOON" in December 2008 (used as the Soul Eater opening) and "Unlimited Sky" in early 2009 (used as an insert song for Gundam 00). In March 2009, Tommy heavenly6 announced plans to release a new album, I KILL MY HEART, featuring 11 new songs & 4 videos, which will feature heavenly6 & february6 reditions of 2 of the songs ("Wait for me there" & "Leaving You"). The Album is set to be released on April 29th.