Yuusha no Haha desu ga, Maougun no Kanbu ni Narimashita.

I lost my husband in an accident two years ago and became a single mother, and one day I was summoned to another world with my son. The humans who summoned us called my son a hero and wanted him to fight the resurrected Demon Lord. It’s ridiculous to have my son, who is in still his first year of junior high, fight against such monsters! Strongly opposing their plan, I was treated as an obstacle and abandoned in a monster’s den. I was powerless and already resigned myself to death, but it was the demons, who were supposed to be enemies of humans, who saved me. As I spent time together with them, my learned to get along with the demons, but the peaceful days did not last long. The only weapons I had were my cooking abilities and my quick wit. "I won’t give up until I find my son!" Working with only this thought in mind, I eventually rose up to become the Demon Lord's top advisor before I knew it. (Source: Tokuma Shoten, translated) Note: Originally serialized on Manga BANG!, it was cancelled after 19 chapters in three volumes in 2023-12. The series was re-started on Comic Unicorn on 2024-06-27.