UFO Princess Valkyrie 4: Toki to Yume to Ginga no Utage

円盤皇女ワるきゅーレ 時と夢と銀河の宴

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)