Sasuke and Ameyuri have low hp so you need shield or a healer. You c*e the leech passive, but since both their mystery is nin only they won't leech that much. You can try replacing Fuguki with Toroi or Mabui for heal and/or shield. Or you can try using GNW Hinata and put her so that she will face 2 rows if your ninja lose much hp to standard attacks.