While under the guise of taking his family on a weekend winter getaway, Loid's attempt to make progress on his current mission Operation Strix proves difficult when Anya mistakenly gets involved and triggers events that threaten world peace.

After a draining December, Sakuta is quickly nearing the end of his second year of high school. Since Mai is a third-year student, they don't have much time left together before graduation rolls around. Meanwhile, his sister, Kaede, is slowly but steadily venturing outdoors again. Just as she begins to find her footing, she announces her most ambitious goal yet—attending her brother's high school! Sakuta knows better than anyone how difficult this will be for Kaede, and he's ready to support her however he can. He's just not sure if that's what's best for her...or what she really wants...

Finally, the day of Mai's high school graduation has arrived. While Sakuta eagerly waits for his girlfriend, an elementary schooler who looks exactly like her appears before him. Suspicious, and for all the wrong reasons... Meanwhile, Sakuta and Kaede's father suddenly calls, saying that their mother wants to see her daughter. She was hospitalized because Kaede's condition had been too much for her to bear, so what could she possibly want now?

One year has passed since Guts left the Band of the Hawk and Griffith was imprisoned by the Kingdom of Midland for treason. In the dead of night, at a camping site where they hide, the Band of the Hawk is attacked by Bakiraka assassins led by Silat. When all seems lost, Guts returns from his journey. "You destroyed everything." Crying that Griffith is nothing without Guts, Casca and Guts are joined together body and soul. Griffith is imprisoned in the oldest building in Wyndham Catle, the Tower of Rebirth.