What kind of future awaits the boy who holds two powers that can change the world? A technological revolution was brought about by The Last Witch, to the world of magic, with the introduction of 'science'. Lyle, a boy wielding the powers of both magic and science, was caught between his childhood friend, the noblewoman Maria who was pressing forward into an era of science, and Lunaria, a girl of the Phantasm race, a symbol of the age of magic. Two different girls, from two different eras and ages. Which will the boy bearing the power to change the world choose? (Source: Baka-Tsuki)

Kazuya is a teenager who is worried about himself acting differently in his daily life then what his heart actually believes. One day he encounters Mio, a serious suicidal girl who slits her own wrist. He is then attracted to her uncontrollably and the two became lovers soon after Kazuya's confession. After spending some time with each other, Mio's personalty is changed bit by bit, right before she was murdered...