Megumi is Tia's partner and a popular pop idol. She first appears in the episode where Tia appears, apparently the day of a concert. Unfortunately, Marcus, Tia's old friend, arrives to fight Tia when Megumi was on stage, leaving Tia defenseless. Megumi, however, manages to help her out when the situation got tight.
Even though she's a pop star, she's just a regular girl. No wonder she was mistaken for a princess in one episode. She's often seen in dresses or skirts.
Back when she started singing, she didn't know what she would end up going through with her future friends. All she wanted was a normal life, as she quoted.