"I understand. I will become Rouga's girl~"
At the beginning of the game, she is a female swordsman entrusted by a certain someone to a temple shrine. She has no memories before meeting Rouga, and her lineage is a mystery. Her behaviour and manner is very elegant and refined. Normally she is a very street-smart, bright girl, but when in battle shows a cold warrior's face and outstanding battle skills. She does incredible things while smiling.
Battle quote - "Well than, shall we dance..."
- She is a clone of the original shrine maiden's DNA (That ancestor in past)
- Senna and other clones were created for in order to keep the seal on Hell Gate
- Senna possesses more of the original shrine maiden's soul which the Academy feared and viewed it as a sort of threat so Academy prepares to kill her but Kamui stepped in and saved her which it was "good" Kamui delivered her to Rouga
- Senna is much more powerful than all other clones
- The original shrine maiden sacrificed herself to seal the Hell Gate in the past and the buttons are used for to seal it
- Senna has a crush on Rouga.