4 Reasons:
1 - Arial was paid to be Reiner bodyguard.
2 - Giovanni will might kill Arial if he heard about something Arial failed in his mission.
3 - Arial kinda owe Reiner for rescue him in the Vampire mission.
4 - Because he promised to Kyubi he will do his job as bodyguard and she will might Flambé him if he broke that promise.
Along with other reasons.
1 - Arial was paid to be Reiner bodyguard.
2 - Giovanni will might kill Arial if he heard about something Arial failed in his mission.
3 - Arial kinda owe Reiner for rescue him in the Vampire mission.
4 - Because he promised to Kyubi he will do his job as bodyguard and she will might Flambé him if he broke that promise.
Along with other reasons.
Kogeki currently ability to active in battles: Anticipation.
