The LEGENDARY SIX NINE is a solo project by RUKA, the drummer of NIGHTMARE, with rotating support members. Today, the project announced its new release, SPLIT EP, which will feature two lineups: one of which is called 「LSN REUNION」 and features JUI (GOTCHAROCKA, ex-VIDOLL) on vocals!
SPLIT EP will be released on 2015-08-05 in two types. TYPE REUNION will feature the song ALPHA by LSN REUNION, PARTY by LSN BELIAL, and memento by LSN REUNION. The TYPE BELIAL version will feature the same first two tracks, plus Fly by LSN BELIAL as the third. Check the band's official website for more info.
JUI and RUKA were in the band Luinspear years ago, so I suppose that's where the “REUNION” in their name comes in!