What kind of title is this?: Manga.
Where can I read it?: Reading links are listed for Seven Seas Entertainment, Naver Series, Official Site. Check availability in your region.

Synopsis

About The Titan's Bride

Mizuki Kouichi is about to take his final exams and graduate from high school when he suddenly finds himself transported to a fantasy world–specifically, to a kingdom of titans! The country’s beautiful denizens are almost twice the size of Kouichi, who was a tall basketball star back home. To his surprise, one of the giants, Prince Caius, claims Kouichi as his bride! Due to a dire prophecy, the prince’s upcoming nuptials cannot be with anyone of his world, so he’s happy to take Kouichi as his “wife.” What starts as big trouble for Kouichi turns into a grand romantic adventure when he finds out that Caius truly has a lot of love to give. (Source: Seven Seas Entertainment)

Fantasy Romance