The Titan's Bride

Kouichi Mizuki is summoned to a world of Giant Titans by ancient magic. Arriving in the land of Tildant, the Prince, Caius, appears in front of Kouichi and says, "Destiny has brought you to me. You are my fated bride!" Kouichi agrees to stay for a month in order to get back home. However, the Prince is in a bind. He can only marry someone from another world, or else Tildant will befall a terrible fate! If Kouichi doesn't stay permanently, will the prophecy ever be fulfilled?

(Source: Ascendant Animation)

Note: The complete edition with explicit scenes was distributed web via Comic Festa Anime Zone. The censored version was broadcasted on Tokyo MX.