In June 2003, Blood Stain Child released their second studio album, Mystic Your Heart, which was co-produced by Anssi Kippo, a popular producer from Finland.
That same year, Blood Stain Child released their third studio album, Idolator, which was co-produced by Tue Madsen, a popular producer from Denmark.
On 18 July 2007, Blood Stain Child released their fourth studio album, Mozaiq in Japan, which was also co-produced by Tue Madsen.
Blood Stain Child performed as special guests at Naka-Kon 2012, in Overland Park, Kansas, between the 10–12 February.
In early 2013 the band introduced their new VJ/DJ - Makoto, which came along with an announcement of Aki being absent from further live shows due to "his personal issues", however, he will remain a member and take part in the creation of music.
[7] In 2018, Blood Stain Child joined forces with Danceroid singer Yuzuki and created the melodic death metal supergroup Yuzukingdom.
The band's sound includes screamed vocals complemented at times by traditional singing, with their overall musical style best classified as a mix between In Flames, Children of Bodom, and Soilwork.