Hayami Yuuna

Protagonist and main heroine of the game.

A high school girl in love with a boy from her class. When she was going to confess she was gang raped and lost her virginity.
After trying to end her life, she discovers that her death triggers a time warp that allows her to repeat that day.
Since saving her virginity to the boy she loves is very important for her, she keeps repeating the same day over and over, looking for a way to avoid being raped.

Spoiler

As the game progresses, her powers improve, allowing her to time travel back to different dates, traveling to the future and traveling to alternate dimensions. In one of these alternate dimensions everybody has a different gender.