Isekai One Turn Kill Neesan

Isekai One Turn Kill Neesan follows otaku Asahi Ikusaba after he saves a child and is suddenly transported to another world, where he expects the kind of cheat abilities common in his favorite games and novels. Instead, he learns the hard way that he is just an ordinary young man when a deadly monster corners him and his supposed powers fail to appear. At the moment Asahi is in real danger, his overprotective older sister Maya appears out of nowhere with overwhelming abilities far beyond anything he imagined. Delighted to be reunited with her brother, Maya makes it her mission to keep Asahi safe at all costs, turning every threat into another reason to stay by his side. As the siblings try to adapt to their new life and search for a way home, their bond becomes the center of a chaotic fantasy adventure. Their arrival also seems tied to a larger fate, since the Demon King's terrifying army is closing in on the world. With no one else able to match that threat, Maya may be the only force capable of standing in its way, while Asahi must survive long enough to keep up with his unstoppable sister.