Yu-Gi-Oh! 5D’s Season 1 Episode 40

Akiza is taken to hospital where her parents, Hideo and Setsuka, meet up with Jack, Leo and Luna. Jack tells them that the only one who can save Akiza is Yusei, so Hideo travels to Satellite to talk with him. He tells him that when Akiza was young, he was unable to spend time with her due to work. When they finally were able to spend some free time together, a call from work interrupted, which frustrated Akiza and awoke her Signer powers and birthmark, hurting her father in the process.