Shio Asou, a former anatomical doctor, seeks a peaceful and healing everyday life. Hoping to unwind, she decides to begin an early semi-retirement together with her childhood friend Mikihiko Sugawa. However, just as their quiet life begins, a massive underground cavity suddenly appears beneath their home—and inside it, a mysterious puppy…? It turns out that this strange chamber is actually one of the many dungeons that have begun appearing all over the world! Before they even realize it, the two become the first conquerors, gaining unprecedented cheat abilities and even a divine beast. Going back and forth between the modern world and a parallel fantasy realm, the duo enjoy a carefree and unconventional lifestyle. “What should we make for dinner?” “Let’s cook this monster!” “Woof!” A heartwarming and relaxed adventure of an early-retirement duo, journeying with their divine-beast pet!