There is constant talk concerning Shinigami's son, Death the Kid's enrolment in Shibusen. Black Star, being the person that he is, is angered that there is someone who is talked about more than he is. He then proceeds to go outside and wait for Kid to appear, along with Soul. Kid, however, is three hours late, as he had spent the entire morning making certain that everything is perfectly symmetrical before his departure. Black Star grows even more impatient at his late appearance. When Kid finally does arrive, he immediately begins to admire the supreme symmetry of the school building; however, he is quickly devastated when Black Star ruins the symmetry by standing on and breaking ones of the spikes protruding out the main skull structure of the entrance. This greatly angers Kid and he prepares to do battle with Black Star, who ends up dragging an unwilling Soul into the fight.
During battle, Kid uses his partners, Liz and Patti with great dexterity and handles both Soul and Black Star with extreme ease. When Black Star expresses his frustration at Kid's long-range attacks, Kid decides to switch to close-range hand-to-hand combat, proving that he surpasses even Black Star in martial arts. The fight soon attracts the attention of the students inside the school; leading to Maka, Tsubaki and Stein having to go outside to watch the fight. Asking Maka to see if Death the Kid is Resonating with Liz and Patti, Maka sees that despite it being difficult to wield two Weapons, the three look up to each other, and thus achieve a perfect balance in Soul Wavelengths. On the other hand, Black Star and Soul's efforts to defeat Kid are futile against him
Black Star and Soul decide to attempt to actually work together as a Weapon and Meister pairing. However, their Wavelengths do not match at all, and Black Star cannot lift Soul in Weapon form. Frustrated, he sends his own Wavelength into Soul, which harms the Demon Weapon. In a 'emotional' moment, Soul decides to break up with Black Star as partners, but Black Star declares that they are still best friends. The two friends hug, but their moment is interrupted as Kid - not being able to resist - shoots the two in the head.
With new resolve, the two go against Death the Kid again. They almost manage to hit him, with Black Star managing to feint a kick and then grab Kid's leg to pin him down, which gives Soul an opportunity to slam into him in Weapon form. However, Kid still manages to dodge, and counter-attack the two. He then proceeds to use Death Cannon. Despite the situation looking grim, Black Star boasts that nothing will defeat him. Obviously, Kid's Death Cannon finishes both of them off.
Kid, surprisingly, loses consciousness too for seemingly unknown reasons. It is then revealed by Maka that, when Soul attempted to slash at Kid, he cut some of Kid’s bangs, with Kid not noticing his broken symmetry until after the explosion. Soul and Black Star both agree that this was their 'win from behind.'
Tsubaki then goes to Black Star and asks if he is alright, though, his only concern is if she saw him and how well he did. Black Star is later seen when Shinigami comes to take home.