A mother who has lost her son goes through his bookcase and convinces herself that he has reincarnated into another world. Searching for a way to meet him, she enlists the help of her otaku former classmate. **Note:** This KADOKAWA-published version has various revisions as compared to [the original version](https://mangadex.org/title/3d109f80-bf4c-41ac-b7fd-e52b29d03a24).