This is a straightforward stage that doesn’t have a lot of mechanics to worry about. It can be important to note that the Kaitenger and Kaiten Mk.1 have a Crit Resist buff. Note that even if the Kaiten Mk.1 is defeated first, it will not end the stage right away.
For team building, you will want an Explosive AoE damage dealer to deal with the Kaitengers and a Single-Target Piercing student for Kaiten Mk.1. You will then want to fill in the slots with the usual students such as a tank, general supports, and healers if needed.
Note that characters listed here are only some of the viable options