The homeroom class gets sucked through a wormhole into - you guessed it! - another world where they encounter a desolate environment dominated by a rampaging magical automaton. There they meet a girl-type golem with mannerisms similar to Megumin, a woman dressed in the same military uniform as Tanya, and a man with a cane who seems to know Subaru, and hijinks ensue. 
 
(Source: Crunchyroll)

The second season of Isekai Quartet.
 
Your favorite isekai characters return for more exciting crossovers in our everyday world! This time the Shield Hero joins in, and he’s brought Raphtalia and Filo along with him. What kind of shenanigans will the crews of Re:Zero, Overlord, KonoSuba, Saga of Tanya the Evil, and now, The Rising of the Shield Hero get into together? 
(Source: Funimation)

The novel series centers on a young girl who fights on the frontlines in war. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. Her name is Tanya Degurechaff, and she speaks with a young girl's lisp and commands the army. Tanya used to be one of Japan's elite office workers, but because of a wrathful god, was reborn as a little girl. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army's sorcerers. 
 
(Source: Anime News Network)

Naofumi Iwatani, an uncharismatic Otaku who spends his days on games and manga, suddenly finds himself summoned to a parallel universe! He discovers he is one of four heroes equipped with legendary weapons and tasked with saving the world from its prophesied destruction. As the Shield Hero, the weakest of the heroes, all is not as it seems. Naofumi is soon alone, penniless, and betrayed. With no one to turn to, and nowhere to run, he is left with only his shield. Now, Naofumi must rise to become the legendary Shield Hero and save the world! 
 
Note: 
- The first episode was pre-aired on December 27th, 2018. Regular broadcast began on January 9th, 2019. 
- The first episode aired with a runtime of ~47 minutes as opposed to the standard 24 minute long episode.

The story takes place in the year 2138 when virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, the protagonist Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as "the most powerful wizard." The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become. 
 
(Source: Anime News Network)

Kazuma Satou decides that today is the day to get out of the house for a bit. Since he dies, pointlessly, it's clearly a bad choice. The goddess who greets him in the afterlife, however, offers him a chance to be reborn in a world not unlike that of a video game, and as a bonus she'll even throw in a cool item or power! Can't possibly be a bad choice, right? Except he arrives with no money at all, dead average skills, and his "bonus" isn't useful at all--since he picked the goddess, Aqua, herself. How are the two of them supposed to defeat the evil Devil King and live happily ever after? Well, for them, it probably starts with day laboring rather than adventuring. And it's only going to get more disappointing from there! 
 
(Source: Crunchyroll)

In the story, Subaru Natsuki is an ordinary high school student who is lost in an alternate world, where he is rescued by a beautiful, silver-haired girl. He stays near her to return the favor, but the destiny she is burdened with is more than Subaru can imagine. Enemies attack one by one, and both of them are killed. He then finds out he has the power to rewind death, back to the time he first came to this world. But only he remembers what has happened since. 
 
(Source: Anime News Network)
 
Notes: 
- The first episode aired with a runtime of ~50 minutes as opposed to the standard 25 minute long episode. 
- In the Winter 2020 season, Re:ZERO was rebroadcast and re-edited to fit into an hour time-slot. This edit included the first OVA and added slight modifications to certain scenes throughout. It also added an additional scene at the end of the final episode.

The third season of Isekai Quartet.
 
The button appeared out of nowhere. Was it a trap or the start of something new? The crews of Re:ZERO, Overlord, KONOSUBA, and Saga of Tanya the Evil got stuck in another world’s class! Now, more new characters join the series, including Alpha and Shadow from The Eminence in Shadow. See what adorable chaos they’ll get up to in this collection of shorts! 
(Source: Crunchyroll)

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