UFO Princess Valkyrie 4: Toki to Yume to Ginga no Utage
Ano: 2006
The strange and magical events of the last season have left Kazuto with two Valkyries. He now finds himself living with and looking after both a teenaged-princess Valkyrie, as well as the child-princess Valkyrie! And they still have not yet gotten married... (Source: AniDB)