Meg

Rin and Ai’s senior, she is known as the strongest warrior, to the extent of being called a “demon god,” despite her gentle and soft appearance.
She has a kind, “big sister” type personality. Her willingness to actively interact with humans makes her an outlier in her world.
She comes to Akitoshi’s apartment as its manager.
In truth, she is secretly tasked with a mission to kill Shin.