But she won't just be singing. The talented Koeda has done the music and lyrics for all eight songs on the album. Ryo of Supercell said early on that he could not really control Koeda, and ended up not even trying. He considered her brilliant, as I do, and let her come up with her own nuances in each song.
I think Koeda is a brilliant new voice: powerful, musical, and inventive. I'm not even surprised that she is writing her own words and music, since she already did a couple of good songs and posted them on her SoundCloud page.
She is writing the new songs, but ryo is doing the arrangements.
The debut concert will be at Tsutaya O-West in Tokyo on June 28. This is a small hall with 200 seats and a capacity of 600 total. I don't believe she has done live performances before, at least not professionally. If I lived in Japan, I'd be applying right now to be selected for a ticket.
Here are a couple of videos of Koeda with Supercell. She began singing with them at 15, so the early videos conceal her face to some extent. It is hard to find pictures of her except by taking screen-caps of the half-hidden views in some of the videos. But she has revealed herself more in some of the more recent videos, and perhaps now that she is 18 she will come out into the open. But she is a musician rather than an idol, so she may remain a bit behind the scenes.