Yey! Another male fellow
Nanas, here is the link to a nice PV of Yousei Teikoku:
YouTube - [PV]Yousei Teikoku（妖精帝國） - Wahrheit
It reminds me a bit Ali Project, which is really awsome as well.
However, Ali Project sounds and looks a bit more mature.
YouTube - [PV] ALI PROJECT － Seishoujo Ryouiki（聖少女領域）