After a sudden turn of events, young Martine regains memories of her past life—as a woman in her 30s who once lived as an office worker. Following the death of her father, she unexpectedly becomes the head of her noble house. But as a child with no experience in governance, she's thrown into chaos—especially since her late father left their territory in a state of near-collapse! “Looks like it’s finally time to use that.” That’s right—Martine possesses a cheat-level magic: Molding Magic, which allows her to create just about anything! With her mysterious powers (and maybe by winning over the cold-hearted duke acting as her guardian through his stomach), Martine sets out to rebuild her land and lead it to prosperity! A charming story of reincarnation, nobility, and magical reform begins!