Kanako & Hina Tachibana are sisters & students at the prestigious Excellent Girls Academy. The students at this academy are the daughters of high-ranking & middle-class people. Their father is also the academy principle.

The academy security is very tight, the moment the alarm sounds, the windows are closed with bulkheads. Because of this, it is almost impossible for outsiders to invade, & even if they succeed, they can't escape.

Kanako is Hina's older sister, she is active & confident, with some siscon tendencies towards Hina. She loves to dote on Hina & is protective of her.

Hina is younger than Kanako, & unlike her, she is timid & shy. It is said that she had major surgery because her body was weak.

Kanako is a third-year student, while Hina is a first-year student.

Kanako has long pale-pink hair with her fringe swept to the side, while Hina's hair is shorter & is a more solid shade of pink than Kanako's

They both wear the school's uniform, a dark-blue double-breasted blazer with yellow accents, over a white long-sleeved dress-shirt. But while Kanako wears a dark-blue short pleated skirt, Hina wears a red short pleated skirt.

Kanako also wears a black necktie around her shirt collar, while Hina wears a red ribbon around her shirt collar. They both wear white knee-high socks & black school shoes.