Soul Eater Episode 11

Tsubaki is confronting Masamune inside the demon blade, but he's beating her easily. Masamune states that Tsubaki is not fighting him seriously. He also claims that the fact of her inheriting their family's techniques and not him was what led him to become evil. Just when Tsubaki is about to be absorbed by her brother, Black Star's voice reaches her, and she gains the will to defeat him, absorbing her very first soul in the process.