While Tsubaki confronts Masamune inside the demon blade, Black Star gets himself beaten by the villagers, but he refuses to fight back or leave her side. Masamune states that Tsubaki is not fighting him seriously and that he always hated her passive behavior. He also claims that the fact of her inheriting their family's techniques and not him, was what led him to become a Demon God candidate. Just when Tsubaki was about to be absorbed her brother, Black Star's voice reaches her, and she gains the will to defeat him, absorbing her very first soul in the process. Back at Shibusen, Black Star shows to the rest of the gang Tsubaki's new form she obtained after defeating her brother, the form of a blade, but he ends up fainting as his powers are not strong enough to handle it yet.
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