Favorite Anime Cake Day

Shuffle!

Gods and Demons coexist together with Humans after the door between each of these worlds had opened. Rin is a normal high school student attending Verbena Academy, spending his days living peacefully with his childhood friend Kaede. Unexpectedly, one day the King of Gods, the King of Demons and their families move into be Rin's next door neighbors. Apparently the daughter of the Gods, Sia, and the daughter of the demons, Nerine, are both deeply in love with Rin after having met him in the past.

Air Gear

Itsuki never thought about seriously riding Air Treck motorized roller blades, until he got his butt handed to him by a street gang of Storm Riders. He discovers a pair of AT's and a box of stickers belonging to the Sleeping Forest street gang. One thing leads to another, and Ikki dons the wheels and begins to ride. As his reputation builds in the AT street fighting/racing world, he begins to develop his own gang and participate in more fights, gaining more and more territory.

Sword Art Online 1

Kirito is among the lucky few enthusiasts who get a shipment of the game SAO, which is used with virtual reality gear called NerveGear. He logs in to find himself, with ten-thousand others, in the scenic and elaborate world of Aincrad, one full of fantastic medieval weapons and gruesome monsters. However, in a cruel turn of events, the players soon realize they cannot log out; the game’s creator has trapped them in his new world until they complete all one hundred levels of the game.

Another

In 1972, a popular student in Yomiyama North Middle School’s class 3-3 named Misaki passed away during the school year. Since then, the town of Yomiyama has been shrouded by a fearful atmosphere, from the dark secrets hidden deep within. Koichi, Mei, and their classmates are pulled into the enigma surrounding a series of inevitable, tragic events—but unraveling the horror of Yomiyama may just cost them the ultimate price.

Blade & Soul

Alka is an assassin for the Clan of the Sword. She's on a journey to find the woman Jin Valel, who killed her master Honithout feeling—not unlike how Alka has learned to kill in her work as an assassin. On her journey, Alka encounters three strange women, each a great warrior in her own right and grapples with her slain master's wish that she leaves the life of an assassin behind.

Blue Exorcist

Humans and demons are two sides of the same coin, as are Assiah and Gehenna, their respective worlds. The only way to travel between the realms is by the means of possession, like in ghost stories. However, Satan, the ruler of Gehenna, cannot find a suitable host to possess and therefore, remains imprisoned in his world. In a desperate attempt to conquer Assiah, he sends his son instead, intending for him to eventually grow into a vessel capable of possession by the demon king.

Samurai Champloo

Mugen's a buck wild warrior—violent, thoughtless and womanizing. Jin is a vagrant ronin—mysterious, traditional, well-mannered, and very strong as well. These two fiercely independent warriors can't be any more different from one another, yet their paths cross when Fuu, a ditzy waitress, saves them from being executed when they are arrested after a violent swordfight. Fuu convinces the two vagrant young men to help her find a mysterious samurai "who smells of sunflowers." And their journey begins. This is a story about love, friendship, and courage... NOT!

Darker Than Black

It has been 10 years since Heaven's Gate appeared in South America and Hell's Gate appeared in Japan, veiling the once familiar night sky with an oppressive skyscape. Their purposes unknown, these Gates are spaces in which the very laws of physics are ignored. With the appearance of the Gates emerged Contractors, who, in exchange for their humanity, are granted supernatural abilities. In the Japanese city surrounding Hell’s Gate, Section 4 Chief Misaki Kirihara finds herself at odds with an infamous Contractor codenamed Hei. Called "Black Reaper" in the underground world, Hei, like his associates, undertakes missions for the mysterious and ruthless Syndicate while slowly peeling back the dark layers covering a nefarious plot that threatens the very existence of Contractors.

Death Note

A shinigami, as a god of death, can kill any person—provided they see their victim's face and write their victim's name in a notebook called a Death Note. One day, Ryuk, bored by the shinigami lifestyle and interested in seeing how a human would use a Death Note, drops one into the human realm.

Demon King Daimaou

After enrolling at the Constant Magic Academy, Akuto Sai discovers he's not just a gifted student with magical powers; he's destined to become the Demon King. And though he's not that crazy about the idea, it drives the girls wild! From the sexy school girls in his class to the skin-obsessed android who's programmed to seduce him, Akuto has no shortage of wacky girl trouble.

Eden of the East

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, is stark naked, except for the gun he holds in one hand, and the mobile phone he's holding in the other. A phone that is charged with 8,200,000,000 yen in digital cash.

Is It Wrong to Try to Pick Up Girls in a Dungeon?

Commonly known as the "Dungeon," the city of Orario possesses a huge labyrinth in the underground. Its strange name attracts excitement, illusions of honor, and hopes of romance with a pretty girl. In this city of dreams and desires, new adventurer Bell Cranel has his fateful encounter with the tiny Goddess Hestia. Thus begins the story of a boy striving to become the best adventurer and a lonely goddess searching for followers both working together to fulfill their goals.

Kaze no Stigma

Kazuma is banished and cast out from his family. Four years later, Kazuma finally returns to Japan, this time as an exceptionally powerful wind user. For the first arc, a series of murders of Kannagi family members have occurred with his arrival. While most of the family, including Ayano, is convinced Kazuma is the culprit, he claims he isn't. These events begin an all-out war against the Kannagi family, with Kazuma and Ayano right in the middle of it.

Kenichi: The Mightiest Disciple

Description is quite lengthy. Basically a weakling of a kid who is bullied and wants to protect those who are dear to him. He joins a mysterious dojo in hopes to fulfill his dreams.

Needless

The year is 2130. After the third world war, large contaminated areas known as "Blackspots" formed all over Japan. Large walls were used to quarantine off these Blackspots. In time, signs of inhabitance appeared within these wastelands. Among the survivors who had been abandoned inside the Blackspots, labeled as "those who were unneeded", came forth possessors of uncanny abilities: fire, wind, brute strength; they were defined by their supernatural abilities. Others, fearful of their powers, expelled them and named them Needless.

Nisekoi

Another lengthy one. This kid Ichijou is the son of a Yakuza boss and attends high school somewhat normally. He has a locket around his neck that was given to him by a girl he made a promise to some years ago. During this time, a rival gang shows up and the daughter, after some conflict, is not very fond of Ichijou. However, they are forced to be together in a fake relationship to keep peace among the gangs.

The Pet Girl of Sakurasou

When abandoned kittens and his good conscience force second year Sorata Kanda to move into Suimei High School’s infamous Sakura Hall, the satellite dorm and its eccentric, misfit residents turn his life upside down. The decidedly average Sorata finds it difficult to fit in with the bizarre collection of dorm residents like Misaki, an energetic animator; Jin, a playwright playboy; Ryuunosuke, a reclusive programmer; and Chihiro, the dorm manager, art teacher, and party girl.

Reborn

Tsuna's boring life takes an extraordinary twist when he encounters the mysterious Reborn, who happens to be a hitman... and shockingly, a baby! Sent from the strongest Mafia family in Italy, Reborn is assigned the daunting mission of preparing the dull middle schooler to succeed the ninth boss of the notorious Vongola family, who is on the brink of retirement. The dull boy has a grueling road ahead, but with the help of his new criminal affiliates and his peculiar home tutor, perhaps even Loser Tsuna can achieve greatness.

Rosario + Vampire

By a bizarre coincidence, Tsukune Aono has accidentally gotten himself admitted to a youkai academy, a school attended by monsters. Just when he thinks he'll run away from there, he meets the beautiful girl Moka and his mood turns ultra happy. However, she transforms into her true form when the rosary on her chest is taken off, she's a super vampire!

Sekirei

One day after talking to his yet again disappointed mother, Minato comes into contact with a girl named Musubi who was under attack. The girl runs but takes him with her and soon finds that Minato, while unknown to him, is an Ashikabi, one of the mysterious set of masters that have the genetic trait that can become partners with some of the 108 cute girls, buxom women, and bishōnen called "Sekirei." The reason for the partnership allows the Sekirei to use all their power to win in the competition held by the mysterious MBI corporation.

Seraph of the End

Yuuichirou and Mikaela Hyakuya are two young boys who are taken captive from an orphanage. Discontent with being treated like livestock under the vampires' cruel reign, Mikaela hatches a rebellious escape plan that is ultimately doomed to fail. The only survivor to come out on the other side is Yuuichirou, who is found by the Moon Demon Company, a military unit dedicated to exterminating the vampires in Japan. Many years later, now a member of the Japanese Imperial Demon Army, Yuuichirou is determined to take revenge on the creatures that slaughtered his family

Shimoneta: A Boring World Where the Concept of Dirty Jokes Doesn't Exist

Sixteen years after the "Law for Public Order and Morals in Healthy Child-Raising" banned coarse language in the country, Tanukichi Okuma enrolls in the country's leading elite public morals school and is soon invited into the Anti-Societal Organization (SOX) by its founder, Ayame Kajou. As a member blackmailed into joining by Ayame, Tanukichi ends up taking part in obscene acts of terrorism against the talented student council president Anna (for whom Tanukichi has a crush on).

Soul Eater

Soul Eater revolves around Maka & Soul Eater, Black Star & Tsubaki, and Death the Kid with Patty and Liz Thompson. Besides taking the time to gather souls, these students of Shibusen defend Death City from some of the most powerful of creatures while still attending school and trying to become stronger.

Tokyo Ghoul

Kaneki, a shy, bookish college student, is instantly drawn to Rize Kamishiro, an avid reader like himself. However, Rize is not exactly who she seems, and this unfortunate meeting pushes Kaneki into the dark depths of the ghouls' inhuman world. In a twist of fate, Kaneki is saved by the enigmatic waitress Touka Kirishima, and thus begins his new, secret life as a half-ghoul/half-human who must find a way to integrate into both societies.

Vampire Knight

Cross Academy is an elite boarding school with two separate, isolated classes: the Day Class and the Night Class. On the surface, Yuuki Cross and Zero Kiryuu are prefects of the academy, and attempt to keep order between the students as classes rotate in the evenings. As the Night Class is full of utterly gorgeous elites, this can sometimes prove to be a bit difficult. It is completely necessary, however, as those "elites" are actually vampires. Yuuki and Zero act as guardians, protecting the secrets of the Night Class and the safety of their ignorant morning counterparts.

Most descriptions courtesy of http://myanimelist.net/.
Apologies for the long descriptions.