My older sister, who lives next door and is only a year older than me, isn't my biological sibling, but she has been taking care of me since I was born. It turns out she had a secret wish: to live in another world. I got dragged into her wish, and now we find ourselves in a dangerous new world. I guess there's no choice but to go with the flow and try to make a life here with my sister. This is the story of a boy who starts his new life in another world with such a resolve.