A young D, Tear Lightning, enrolls at Midgard and claims that Yuu is her husband as he was the person who saved her life from a criminal group. However, Tear's behaviour and firm belief that she's a Dragon make things difficult. Eventually, Yuu convinces her to open up to her classmates and she starts becoming more social. However, when Lisa attempts to teach Tear how to form a Fictional Armament, Tear's deeply-rooted belief that she is a Dragon causes her to encase herself in a giant dragon-shaped Fictional Armament, which goes berserk and starts rampaging.