Sakura Akino, nicknamed Cosmos (秋桜), is a third year High School student and the Student Council President.

Cosmos is a hardworking and proper girl who is very organized and always on time, if not early, to everything. She always carries her notebook, in which she writes frequently to make notes and plans.

Cosmos's whole demeanor changes when she is nervous, especially around Sun (Cosmos' crush). When she gets nervous, she panics when speaking, which leads to her saying the wrong thing, and she sometimes even talks like a cat-girl unintentionally.
She has something of a coping mechanism to suppress her panic when speaking, in which she talks like an Edo-era samurai.