Mana is a teacher who just got her position.
With her beauty, she was instantly favorite of everyone.
However, a group of man decide to violate her.
Caught by an evil desire, she is violated at every locations in school.
Her virginity is stolen, and her womb being flooded with cum, imprinted with male's smell.
"Why did this happen ... ?"
Her dream of becoming a respectful teacher was ruined with continuously repeated violation and humiliation, and thus turning her life into a slave life.

[Edited from DLsite english]