Kimi sae mo Ai no Kusari

Shouta Koishikawa and Miono Hasuoka are childhood friends who have grown up together. Shouta begins to see Miono as more than a friend, but she becomes drawn to her science teacher, Professor Kaorumaru, who claims a future where her destined love will awaken a new side of her. On the day Shouta tries to confess his feelings, the demon Ginyasha takes over his body, triggering a change in Miono. Shouta must now battle the demon while dealing with the unpredictable future Kaorumaru foretold. A cycle of fate, begun long ago, is nearing its conclusion.