She is Suigintou's master, but has a complicated relationship with her. Megu considers her as the dark angel who has come to take her life away. Suigintou often calls her a sick and insane master, who is suited for her. She is also the first person Suigintou has ever cared about besides Rozen. Suigintou often worries about Megu's health. She cares about her to the point that she promises that they will die together.
Suigintou and Shinku are not clsoe, but are shown to be more as rivals rather then as enemies, (There is a situation where the two are forced to cooperate together to defeat Kirakishou, and whilst they have arguments and generally bicker comically amongst themselves, they are not mortal enemies.)
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