Magomusuko to, Magomusume to, Himago to, Toride (E05)

A Grandson, a Granddaughter, a Great-Grandson, and a Fortress Cayna visits Sakaiya with the help of Elineh to deliver the letter that Mai-Mai had asked her to deliver. Once she gets there, she finds out that the master of Sakaiya, Caerick, is actually Mai-Mai's son, which would make him Cayna's grandson! The surprise was a success! Or so Mai-Mai would've hoped, but Cayna ends up extremely angry at Mai-Mai. Not knowing how to process any of this, Cayna returns to the inn she's staying at and then encounters Caerick's twin sister Caerina and... (Crunchyroll)