You must been heard about Yuya reforming into a group called X4. They will releasing their first album this 22 February 2015 on iTunes, Amazon MP3 and Rechukoku. This band will also make their first live tour on Japan this March.
This band was signed under Yuya label ; Japanese Dream Records and there are 4 of them ; Yuya x Koudai(BOYCE) x Takuma(EDEN) x Seiji(BOYCE).
Here are links to their official sites: