Asahi, a boy who loves video games is killed in a traffic accident and ends up in another world. He tries to enjoy the otherworldly adventuring life he's always dreamed of, but his stats are on the level of an NPC's. He is in big trouble and is being chased by a monster when he hears, "Fear not, little brother!" and the monster is killed in one hit by Asahi's older sister, Maya, who followed Asahi to this world. So Maya has acquired some seriously OP skills, but she takes her adoration of her younger brother to extremes. Thus begins their story about an overpowered older sister with a brother complex and a younger brother with the weakest of stats in another world.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Did You Call for Your Big Sister? | 2023-04-08 | 24 min |
| Season 1 | Episode 2 | You Call Me Your Sister? | 2023-04-15 | 24 min |
| Season 1 | Episode 3 | My Sister, Maya-nee, Is All I Need | 2023-04-22 | 24 min |
| Season 1 | Episode 4 | The Big Plan for the Home of the Ikusaba Brother and Sister | 2023-04-29 | 24 min |
| Season 1 | Episode 5 | The Ikusaba Brother and Sister's Big Dungeon Exploration Plan | 2023-05-06 | 24 min |
| Season 1 | Episode 6 | The Hero and the Big Sister | 2023-05-13 | 24 min |
| Season 1 | Episode 7 | Portrait of a Certain Big Sister and Little Brother | 2023-05-20 | 24 min |
| Season 1 | Episode 8 | I Can't Raise My Sword Against a Girl | 2023-05-27 | 24 min |
| Season 1 | Episode 9 | The Preferred Form of a Big Sister | 2023-06-03 | 24 min |
| Season 1 | Episode 10 | My Amazing Little Brother | 2023-06-10 | 24 min |
| Season 1 | Episode 11 | Shark from Another World | 2023-06-17 | 24 min |
| Season 1 | Episode 12 | Big Sister Forever | 2023-06-24 | 24 min |
| Directing | Hiroaki Takagi | Series Director |
| Writing | Yohei Kashii | Series Composition |
| Visual Effects | Yuji Hamada | Character Designer |
| Visual Effects | Maho Tanabe | Character Designer |
| Art | Kenichi Kurata | Art Direction |
| Visual Effects | Ryota Katsuta | Color Designer |
| Visual Effects | Maki Yamamoto | Color Designer |
| Camera | Atsushi Tamura | Director of Photography |
| Writing | Kenji Taguchi | Original Story |
| Visual Effects | Kenichi Kangawa | Creature Design |
| Art | Naomi Shinoda | Prop Designer |
| Editing | Keisuke Yanagi | Editor |
| Sound | Nobuyuki Abe | Sound Director |
| Sound | Shusei | Original Music Composer |
| Production | Fumihiro Ozawa | Producer |
| Production | Shinji Omori | Producer |
| Production | Yuki Konishi | Producer |
| Production | Yoshinobu Iwatani | Producer |
| Production | Hiroshi Nishiyama | Producer |
| Production | Taku Kato | Producer |
| Sound | Momo Asakura | Theme Song Performance |
| Sound | Shiina Natsukawa | Theme Song Performance |
| Sound | Sora Amamiya | Theme Song Performance |
| Editing | Ryotaro Tate | Online Editor |
| Editing | Kazumi Taniguchi | Online Editor |
