Peddler in Another World: I Can Go Back to My World Whenever I Want (Manga): Volume 3 by Shizuku Akechi

In her short life, Aina has faced more than her fair share of hardships and woe. After her hometown was ravaged by war, her mother whisked her away so that the two of them could start a new life elsewhere. Mother and daughter wandered from land to land until they finally came across a sleepy, out-of-the-way town called Ninoritch, where they decided to stay, hoping that war would never again intrude on their lives. But life was hard here too, for they were poor, food was scarce, and toiling away in the fields was backbreaking work. Aina’s mother soon fell ill, and desperate to save her, the little girl turned to the only person who might give her the money to get her mother the help she needs. But Shiro has seen these symptoms before, back in his own world. Will he manage to cure Aina’s mother before she succumbs to this awful disease?