Grieva will release a new single next week and uploaded the PV preview today.
The single is titled "fuminshou" (不眠症) and drops on October 14th. Even though the CD features only one song titled "insomnia" it costs 1080 Yen. You might wonder why but you can probably find the answer in the amount of copies. The release is limited to 999 copies, so hurry if you want to get your hands on one!
Want to check out the song first? Here is a preview for the PV: