Mayu Sumimori

Mayu Sumimori 「住森麻夕」is in change of accounting and intelligence gathering for the CCC, however she's not good at detailed work and often makes mistakes. She comes from a wealthy family who had connections to the CCC. Her code name is 11 (Eleven).

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.