Prison Break Grandpa An elderly man escapes from prison and infiltrates the Yozakura house, revealing himself as the siblings grandfather Ban. For years, he has posed as a prisoner to gather information for the police. However, due to being a reckless womanizer, Hotokeyama demands he return to prison. Ban escapes with Taiyo to bond with his new grandson-in-law. He reveals he married into the Yozakura family like Taiyo did and is impressed by his dedication to Mutsumi. Ban is suddenly captured by his wife Keiko, Mutsumi's grandmother, who knew he would escape prison for their anniversary...