Rin Yamamoto

The mother of Megumi and Jun, age 40, Rin is well-known as a genius vocalist who frequently travels the world to perform concerts, having just returned from Germany to Japan. She is cheerful and energetic and, like Kei's father, looks much younger than she actually is. The twins have not seen her in two years and are notably surprised when she drops by to visit them when she happens to have a concert in Japan. Rin is apparently very protective of her children; in response to a letter Megumi had written to her mother when she believed that she had been jilted, Rin reveals a rather bloodthirsty streak and comically pulls out a gun to go and attack the boy who supposedly rejected her daughter. Rin first appears in chapter 85.

(Source: Wikipedia)