Tierra Sensei (ティエラ先生) is the teacher at Goryoukan Academy.
Tierra is the tutorial guide and a teacher at the girls' school. Many of the girls look up to her as a good example of an adult woman and she considers herself a novice beauty teacher along with her normal teaching role.
- In the Tecmo Koei's 3D fighting game, Dead or Alive 5 Last Round, the character Helena is dressed as Professor Tierra (Tierra Sensei) in the Schoolgirls Strikers Mashup Set. For the PlayStation 4 and Xbox One versions of the game, she can transform her teacher uniform into a battle outfit and viceversa via pressing the Taunt Button, and doing a Power Blow or Power Launcher.
- Helena's outfit is contrary to the original game. Because Tierra Sensei does not transform, she only commands the Fifth Force for the Obli combat.