Mayu Sumimori

Mayu Sumimori (住森 麻夕) is in charge of the accounting and intelligence gathering for the CCC, in which she goes under the code name 11 (Eleven). However, she's not good at detailed work and often makes mistakes. She comes from a wealthy family who had connections to the CCC.

She used to have a thing for Zero Two, but her feelings for him have died down after Plan B didn't go smoothly. Now, it's Zero Six who's on her mind.

She has an inferiority complex due to having beautiful parents and sisters. She doesn't feel as pretty as her name sounds.