Asahi loves the idea of magical fantasy worlds. And somehow, he’s transported to one! He’s eager to explore and use his new abilities, except he learns he doesn’t have any. But his older sister Maya is in this world too, and she ends up having the strongest cheat skills imaginable! Now, Asahi starts his new life with a doting sister who can kill any beast with one hit. 
 
(Source: Crunchyroll) 
 
Note: Each episode streamed 24 hours early on ABEMA.

Episode 1 - Did You Call for Your Big Sister

Episode 2 - You Call Me Your Sister?

Episode 3 - My Sister, Maya-nee, Is All I Need

Episode 4 - The Big Plan for the Home of the Ikusaba Brother and Sister

Episode 5 - The Ikusaba Brother and Sister's Big Dungeon Exploration Plan

Episode 6 - The Hero and the Big Sister

Episode 7 - Portrait of a Certain Big Sister and Little Brother

Episode 8 - I Can't Raise My Sword Against a Girl

Episode 9 - The Preferred Form of a Big Sister

Episode 10 - My Amazing Little Brother

Episode 11 - Shark from Another World

Episode 12 - Big Sister Forever

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