Sena

Sena is the special prosecutor of the Kingdom of Belzerg in charge of serious crimes, such as treason and conspiring with the Devil King. She was sent to arrest and investigate Kazuma when the teleported Destroyer core blew up Alderp's mansion. Despite Kazuma's innocence, she remains suspicious of his activities and summons him to solve various situations, including the confrontation with Vanir.

From Wikipedia