Yuuwakusha: Kedamono Triangle

Nanae's parents arranged the marriage between Nanae and their family friend's son, Kyo. The couple was in a stage of pure love when Nanae suddenly encountered Shigure. on their first meeting, Shigure told Nanae that she had never been in love. Knowing that Nanae was already engaged to Kyo, Shigure began his seduction on Nanae. Nanae began to waver. What could Shigure's real purpose be?