One characteristic is often the presence of violence. For example, in 'Berserk', there are intense battle scenes with a lot of bloodshed. Another characteristic can be mature themes such as sexuality. Some anime might touch on complex relationships and adult - oriented topics. Also, strong language can be part of it in some cases, though not as common as in live - action rated R works.
Well, it depends on the specific story. Some 'phantom submarine' tales might be based on real submarines that were involved in covert operations. For example, during the Cold War, both sides had submarines doing secretive patrols and surveillance. If one side detected an enemy sub briefly and then lost track of it, it could be called a 'phantom submarine'. So in the context of a true story, it might be a real military sub.
R-15 was a manga created by the Japanese manga artist Amagatsu, while the Lost Housekeeper was a light novel. There were some works that were adapted from light novels into anime, such as Evil Crown, About My Reincarnation as a Slime, Sword Art Domain, and so on. These works usually had excellent storylines and characters that were loved by the audience. However, due to copyright and review, the animation process of these works may be more complicated.
A really cool submarine book is 'Voyage to the Bottom of the Sea' by Irwin Allen. It has a lot of exciting adventures and scientific exploration as the crew of the submarine Seaview faces various threats and mysteries. It combines action, science, and adventure very well.
Anime like 'Ghost in the Shell' often contains mature themes that might be considered in the realm of 'rated R' for anime. It has complex philosophical ideas, some violence, and nudity in certain versions. However, it's also a very thought - provoking work that delves into questions of identity in a cybernetic future.
It could be a lost or abandoned submarine. Maybe it was part of a military experiment that went wrong, and it's now drifting around, appearing and disappearing like a phantom.
I'm not sure if there is a specific fanfic with that exact title. But if it exists, it might be about Harry Potter being an exchange student in an anime - like world. Maybe he would learn different magic systems from anime, meet anime - style characters, and have adventures that combine the elements of Harry Potter's world and the wild creativity of anime.
The R18 was a motorcycle model launched by BMW. It was the first BMW cruiser model to be equipped with a high-displacement horizontal engine. It was divided into R18 Pure, R18 Founder, and R18Classic Founder, priced at 249,900 yuan, 279,900 yuan, and 299,900 yuan respectively. The R18 was BMW's first cruise car in recent decades, and it was also BMW's first vehicle in recent decades to be equipped with a large displacement engine. This model had the heritage and innovation of the classic BMW R series.
" I Have a Water World, Fishing a Nuclear Submarine " was a completed novel by Ji Yu. This novel told the story of the protagonist owning a water world and obtaining various rewards by salvaging wreckage such as submarines. Other than that, there were other similar novels, such as Survival in the Deep Sea: The First Submarine and Treasure Hunt in the Ocean: The First Fighter.