Cecilia is a first year student at the IS academy and is the IS cadet representative from England, as part of the British Aristrocracy. Her father was a weak and timid man who had little influence both outside and inside the Alcott family which made her swear to never marry a weak man (A difficulty due to the shift in social status). She was orphaned 3 years ago after a train accident and was forced to protect her family fortune from those who wish to claim a stake of it. She pilots the Blue Tears IS.

Spoiler

At the end of episode 2, she started harboring feelings for Ichika who has strong and idealistic eyes