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.
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.
On 1 February 2019, Blood Stain Child released a new single, entitled "Del-Sol" as well as an accompanying music video.
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.