Cardfight!! Vanguard (2011) : 7x15

To prevent Luna from being sacrificed for the Company's project, Am cardfights Enishi. She resolves herself to save Luna even if it means losing the chance to revive her parents. On the other hand, Enishi reveals his past in which he and a female friend suffered from a disease. He swore to protect her, but the girl eventually died while Enishi lived, which he thinks her life was given to save his. Believing that Luna's sacrifice is necessary for the sake of a better future, Enishi defeats Am and banishes her from the Company.