Sae Nagumo

Sae Nagumo is a young girl and the male protagonist's first love. She has short-term amnesia that prevents her from retaining events after waking, a condition she initially tries to conceal so she can be treated as an ordinary healthy girl. To compensate, she always carries a “Book of Memories.” A nurse watches over her as a guardian, and Sae still considers her a friend despite the nurse's initially difficult manner.