Parody opening for a spin-off of Mahou Shoujo Madoka Magica, starring the characters from the upcoming visual novel game SoniComi by Nitro+. 
This was released by Nitro+ as an April fools' prank, complete with an official website announcing a full TV series.

Super Sonico is the mascot girl of the "Nitro Super Sonic" events held by Nitroplus. In her back story, she is already a photoshoot model, game character, and a musician, even as she studies as a college student.

Self-proclaimed mad scientist Okabe Rintarou lives in a small room in Akihabara, where he invents "future gadgets" with fellow lab members Shiina Mayuri, his air-headed childhood friend, and Hashida Itaru, an otaku hacker. The three pass the time by tinkering with their latest creation, a "Phone Microwave" that can be controlled through text messages. 
 
The lab members soon face a string of mysterious incidents that lead to a game-changing discovery: the Phone Microwave can send emails to the past and thus alter history. Adapted from the critically acclaimed visual novel by 5pb. and Nitroplus, Steins;Gate takes Okabe to the depths of scientific theory and human despair as he faces the dire consequences of changing the past.

Fuminori Sakisaka, a young man who lost his family in a tragic car accident, has his life saved through an untested surgical procedure. However, thanks to a strange side-effect, all that comes upon his eyes appears twisted and ugly. All except for the beautiful girl who goes by "Saya", who draws the color of beauty to Fuminori's stained existence. For him, she is the only strand of light still remaining in life.
 
(Source: Seikaisha, translated) Note: Includes 1 extra chapter.

A young man wakes up in a strange room with no memory of who he is or how he got there. His past is lost—and his future belongs to Inferno, a violent crime syndicate. They give him a new name—Zwei—and team him with their top assassin, the enigmatic Ein. She’ll teach Zwei all he needs to know about his new life as an Inferno operative, starting with lesson number one: kill or be killed.
 
(Source: Crunchyroll)

The protagonist regains his consciousness to find himself falling down from the sky. As he realizes that he doesn't know why he's here, even more, that he doesn't remember anything at all, three girls flying on brooms appear in front of him. Shortly after as he keeps falling he witnesses a tragic battle between these girls calling themselves Etoile and the monsters they call Zodiac to take place.

One night the protagonist sees a beautiful woman in distress; he tries to help her but she bites him. She turns out to be a vampire! And now he will turn into a vampire too, unless he finds her again and destroy her first. He then joins with a group of vampire-hunters.
(Source: VNDB)

Shibuya, Japan, 2008. Takumi Nishijou, a high school student at the Private Suimei Academy, one day hears about the 'New Gen' murders that have been occurring around the city. Although dismissing the subject because it doesn't involve him, Takumi begins to experience strange mishaps around him, from a horrific picture he received while on his PC, to a mysterious Pink-Haired girl standing at a murder scene. 
From there on Takumi struggles to cope with the events unfolding around him, and is soon unaware of what is real or a delusion. As his fate opens up before him, the perpetrator behind the 'New Gen' events attempts to find him, leading him into a world where nothing is as it seems.

31 December 2010 at 18:00. New Year’s Eve in Akihabara. The cylinder of fate of six people starts to turn in connection with a pistol called Azanael that can grant wishes…!!

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 such 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... 
 
Notes: 
- Due to the 2011 Tōhoku earthquake and tsunami, the broadcasts of episodes 11 and 12 were delayed and were later aired as a double feature on April 21, 2011.

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