The siblinghood between "Youta" and "Hikaru" ends today.Hikaru is pressuring Youta to take their relationship too far and too fast for her brother, who still can't see Hikaru as anything but a little sister. But Hikaru is unwilling to take "no" for an answer. As tensions escalate between the siblings-turned-lovers, onlookers Oda and Mayama can't help but notice the uncertainty in "Hikaru"--a weakness Oda fully intends to exploit! But the opportunity turns to disaster when Oda and Mayama's hasty pursuit leads to an accident that changes everything...