Coming in at fifth installment is Thracia 776, a side story that took place between chapters 5 and 6 of Seisen no Keifu. It includes many characters from Seisen no Keifu, and was released on the Super Famicom.

Obviously I don't have much to say on it as it was a side story I've never played. I'm getting the info of the Japan-only games from the Fire Emblem Wiki.