Studio PuYUKAI Anime
Isekai Quartet
The button appeared out of nowhere. There weren't any signs NOT to push it... so the solution is obvious, right? Is it a trap or the start of something new and exciting? The crews of Re:Zero, Overlord, Konosuba, and The Saga of Tanya the Evil will find out when they go from their world to another and get stuck in... class?! See what adorable chaos they'll get up to in this collection of shorts!
(Source: Funimation)
Isekai Quartet 2
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)
Isekai Quartet: Another World
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 simllar 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)
Isekai Quartet 3
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)
Overlord: Ple Ple Pleiades
Overlord specials featuring super-deformed characters, bundled with the Blu-ray and DVD volumes of Overlord.
Began airing after episode 5 of Overlord - each episode is available on the official site for a short period afterwards.
(Source: AniList.co)
Re:Zero kara Hajimeru Kyuukei Jikan (Break Time)
Subaru Natsuki's sudden arrival in another world brought nothing short of tension and despair—but that does not mean there is no time for a break! The Kingdom of Lugunica is home to an array of interesting tales and lively characters, all waiting to be discovered. As Subaru explores this fantasy world, he learns that it may not be so different from his own.
(Source: MAL Rewrite)
Re:Zero kara Hajimeru Kyuukei Jikan (Break Time) 3rd Season
Yoru wa Neko to Issho
When Fuuta comes home tired at night, all he wants to do is spend time with his new cat. All the mysterious habits and mannerisms of house cats are carefully reproduced in this relaxed and cute comedy about living with an adorable furball!
(Source: Yen Press)
