Animes I started watching at some point

As the world is in the middle of an industrial revolution, a monster appears that cannot be defeated unless its heart, which is protected by a layer of iron, is pierced. By infecting humans with its bite, the monster can create aggressive and undead creatures known as Kabane. On the island Hinomoto, located in the far east, people have built stations to shelter themselves from these creatures. People access the station, as well as transport wares between them, with the help of a locomotive running on steam, called Hayajiro. Ikoma, a boy who lives in the Aragane station and helps to build Hayajiro, creates his own weapon called Tsuranukizutsu in order to defeat the creatures. One day, as he waits for an opportunity to use his weapon, he meets a girl named Mumei, who is excused from the mandatory Kabane inspection. During the night, Ikuma meets Mumei again as he sees Hayajiro going out of control. The staff on the locomotive has turned into the creatures. The station, now under attack by Kabane, is the opportunity Ikoma has been looking for.

Ohana Matsumae, a girl from Tokyo, is forced to leave her hometown to live at an inn with her grandmother whom she's never met. When she arrives, she finds out she'll have to work at the Inn to stay. What awaits is her journey of friendship, love, self-discover and dreams.

Vampire queen Mina Tepesh comes out of hiding to offer peace between vampires and humans. Japan gives her a bund, where she goes to live with her people. However, extremist human and vampire groups do not want to coexist.

In Tokyo, an impenetrable field known as "Hell's Gate" appeared ten years ago. At the same time, psychics who wield paranormal powers at the cost of their conscience also emerged. Hei is one of the most powerful of these psychic agents, and along with his blind associate, Yin, works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate.

Follows the adventures of Koyomi Araragi, a former vampire. One day, a classmate named Hitagi Senjougahara, a loner, falls down the stairs into Koyomi's arms. Hitagi appears to weigh next to nothing, defying physics. Despite being threatened by her to keep away, Koyomi offers his help, and introduces her to Meme Oshino, a strange middle-aged man living in an abandoned building, who cured him of vampirism. Koyomi becomes gradually more involved in cases related to unusual supernatural creatures, meeting new people and discovering secrets in the people he thought he knew.

In a post-apocalyptic world set a thousand years after our era, the remaining humans, now with telekinesis, live in a seemingly peaceful society, but dark secrets of the past will soon be discovered by a small group of friends.

In a post-apocalyptic future where humans live in domed cities surrounded by wasteland, wolves are assumed to be two hundred years extinct. Yet wolves do walk among them, disguising themselves as humans in order to survive in the human world. Now four young wolves will follow the scent of Lunar Flowers on a dangerous quest to find that which legend promises them: Paradise.

The story follows Issei Hyodo, a dim-witted, lecherous second-year high school student who is killed by a girl on his first date ever. Issei is reincarnated as a demon, and from that day forward, he serves as an underling of Rias Gremory, a high-level demon who is also the prettiest girl on Issei's campus.

Honnouji Academy is forcefully ruled by the iron-fisted control of its student council and its president, Satsuki Kiryuuin. Transfer student, Ryuuko Matoi, arrives on campus carrying a giant sword, that is actually half of a scissor. She is looking for the woman who holds the other half of her sword who killed her father. It is said that Satsuki Kiryuuin knows the identity of the killer but when Ryuuko confronts her she is beaten by the student council and their powerful "goku uniforms" whom she cannot match in strength. However, once Ryuuko receives her own "Kamui" by the name of Senketsu , the odds are lifted in her favor.

Humans are nearly exterminated by giant creatures called Titans. Titans are typically several stories tall, seem to have no intelligence, devour human beings and, worst of all, seem to do it for the pleasure rather than as a food source. A small percentage of humanity survived by walling themselves in a land protected by extremely high walls, even taller than the biggest of titans. Flash forward to the present, and mankind has not seen a titan in over 100 years. One day, 10 year old Eren and his foster sister Mikasa witness something horrific as the city walls are destroyed by a colossal titan that appears out of thin air. As the smaller titans flood the city, the two kids watch in horror as their mother is eaten alive. Eren vows that he will murder every single titan and take revenge for all of mankind.

One night, 14-year-old Madoka Kaname has a terrible nightmare - against the backdrop of a devastated city, she witnesses a girl fight a losing battle against a dreadful being lingering above, while a cat-like magical creature tells Madoka the only way to change that tragic outcome is for her to make a contract with him and become a magical girl. The next day, the teen's dream seemingly becomes reality as the girl she saw in her dream - Homura - arrives at Mitakihara Middle School as a transfer student, mysteriously warning Madoka to stay just the way she is. But when later on she and her best friend Sayaka encounter the same cat-like magical creature from her dream - who introduces himself as Kyubey - the pair discovers that magical girls are real, and what's more, they can choose to become one. All they must do is sign a contract with Kyubey and agree to take on the duty to fight abstract beings called 'witches' that spread despair to the human world, and in return, each one of them will be granted any single wish they desire. However, as Homura's omen suggests, there might be far more to becoming a magical girl than Madoka and Sayaka realize.

Rebellious teens fight in armed combat against one dispassionate girl's supernatural powers in an afterlife high school.

While fighting an intense inter-galactic war, a mecha pilot was accidentally warped into a space-time neither he nor the computer of his mecha could recognize. After waking up from a long-time hibernation, he found himself trapped on a planet, with human residents talking in an unknown form of language, using inferior technologies, and - most shocking to him - naturally breathable air.

Renton Thurston is a 14-year-old boy who lived with his mechanic grandfather in a backwater town. Every day he dreamed of being with the mercenary "Light Finding Operation (LFO)" aircraft pilot group "Gekkostate" and riding "Trapar" particle waves-- a sport called "Riffing"-- with their charismatic leader Holland, especially when faced with his father's acclaimed past or his grandfather's desire to protect him. When a young girl named Eureka riding the original LFO, the "Nirvash typeZERO", asks his grandfather for a tune-up, she inadvertently brings the attention of the military to the garage; as a result, the garage is destroyed and Renton is forced to deliver a new type of interface-- the "Amita Drive"-- to the Nirvash. After a heated fight in which the Nirvash destroys the military LFOs by unleashing an immense amount of power, Renton is invited into Gekkostate. However, he quickly realizes that behind the facade of a traveling group of mercenaries is a very bitter reality.

On November 22, 2010 ten missiles strike Japan. However, this unprecedented terrorist act, later to be called as "Careless Monday," does not result in any apparent victims, and is soon forgotten by almost everyone. Then, 3 months later... Saki Morimi is a young woman currently in the United States of America on her graduation trip. But just when she is in front of the White House, Washington DC, she gets into trouble, and only the unexpected intervention of one of her fellow countrymen saves her. However, this man, who introduces himself as Akira Takizawa, is a complete mystery. He appears to have lost his memory. and he is stark naked, except for the gun he holds in one hand, and the mobile phone he's holding with the other hand. A phone that is charged with 8,200,000,000 yen in digital cash.

They are called Chiropterans, ravenous creatures that can change their form, disguising themselves as human beings. Immortal creatures that feed off blood, they hide themselves among us. An organization called the Red Shield has been waging a private war to wipe them out. Now the struggle has grown. Saya Otonashi is a normal high school student who suffers from amnesia; she can't remember anything before the past year of her life. Then one day, a man named Hagi appears and gives her a katana, and her destiny is only partially revealed. The journey for the truth begins...

The Empire of Britannia has invaded Japan using giant robot weapons called Knightmare Frames. Japan is now referred to as Area 11, and its people the 11's. A Britannian who was living in Japan at the time, Lelouch, vowed to his Japanese friend Suzaku that he'd destroy Britannia. Years later, Lelouch is in high school, but regularly skips out of school to go play chess and gamble on himself. One day, he stumbles on terrorists 11's who've stolen a military secret and is caught by a member of the Britannian task force sent after them, who is Suzaku. As the rest of the squad arrives, Suzaku is shot for disobeying orders, while the military secret, a young immortal witch, gives Lelouch the power of Geass, which makes anyone obey any order. While Suzaku is secretly made the pilot of Britannia's brand new prototype Knightmare, Lancelot, Lelouch becomes the masked Zero to lead the rebellion to destroy Britannia once and for all.

Elder Tale is an online fantasy RPG that has become popular worldwide. But when its twelfth expansion package, "Novasphere Pioneers" is installed, thirty thousand players in Japan are trapped inside. Among them is grad student Shiroe, who isn't very good at interacting with others. But to survive in a world full of monsters, he forms a guild called "Log Horizon" with an eclectic group of other players.