Fight!! Iczer-One - S01

Nagisa is an ordinary schoolgirl with typical habits-waking up late, rushing to school, and meeting friends along the way. One morning, she notices a woman in a strange uniform staring at her, leaving Nagisa unsettled. Later that day, while gazing out the window, she sees a ball bouncing on its own before suddenly hurling itself at her seat, shattering the glass but leaving her unharmed. When she turns back, a gaping, tooth-filled mouth is inches from her face, with no one else around. She screams-and suddenly everything is normal again, her classmates staring at her in confusion. No one else saw anything... so why did she scream?