Tilarna takes down an escaping plane with her sword, as it collapses into pieces in a nearby swamp shortly after takeoff. The police are unable to find the plane, but discover a crate full of several objects. Kei tasks Tilarna to catalogue the items from the crate for tomorrow, but the cat Kuroi trips over a tiny crossbow, firing a bolt that pierces Tilarna's arm. Kei wakes up to find both Tilarna and Kuroi acting odd, and leaves for the police station himself. Tilarna finds herself trapped in Kuroi's body, and vice versa, due to some magic in the crossbow. However, Kei accidentally tosses the crossbow out with the trash...