Ryoujoku Fukushuu Gakuen ~Rinkan no Houkago~

Junichi has a girlfriend, Ayaka. One day, when they are on their way home, he is hit by someone, and becomes unconscious.... When he regains his consciousness, he finds Ayaka being raped by several men.... A few days later, Ayaka regains her consciousness in the hospital. But, she has lost all of her memories.... Junichi gets mad, and decides to take revenge...