Boy... this was hard to do... =-=
First to use the IK bones right, they need to be in japanese names Left IK bone wrist 左腕ＩＫ and right KI bone wrist 右腕ＩＫ.
And second the VMD motion for the paino keep crashing because the newer MMD version is not compatible. So I had to download older verion of MMD. =-=
But in the end it did came out good! ^^
My Models: LAT Celesté
Motion: Angel beats! - https://youtu.be/GRXZ4_VJAXY
Stage: Cantarella Stage - https://www.deviantart.com/harukasakurai/art/MMD-PDF-2nd-Cantarella-Stage-DL-473461676