Here is a audio sample from the concert I believe the piece is by Mas Koga “Stars above Tohoku”:
at about 4:30 in his intro he says its called “Stars Across The Ocean” — the tape is a medley, a catch. I think the band also recorded it, intending to live stream. Separately, Motoko Honda performed piano solo as opener. (She’s not affiliated with the Otonowa project but I invited her to perform).