You mean the ”Live at Anywhere” one? It.s probably not a proper single, maybe something to promote her lives. It.s official, I found it listed on her official website for a June 05, 2015 release. It is a mora digital exclusive from what I read there.
The three live versions (1. 冬のダイヤモンド -Live ver.- 2. Cold Sun -Live ver.- 3. 六等星の夜 -Live ver.-) are part of her
Live at Anywhere Vol.26 ”Brave Shine” which took place on June 04, 2015. The setlist includes a total of 10 songs. She performed some old songs, some Midnight Sun ones and also the new single ”Brave Shine”.
She.s so cute in these mini concerts, and her voice tends to be much more powerful.
The whole setlist is:
1) broKen NIGHT
2) ポラリス
3) StarRingChild
4) Anata Ni Deawanakereba
5)
Ophelia (premiere performance)
6) Cold Sun
7) Kanashimi wa Aurora ni
8) Fuyu no Diamond
9)
Brave Shine (premiere performance)
10) Rokutosei no Yoru
Here is the link to the mini concert and also to Brave Shine pv :
https://vk.com/video?gid=69837934