En un mundo de cazadores superdotados y monstruos, un débil cazador adquiere poderes a través de un misterioso programa, lo que le lleva a convertirse en uno de los cazadores más fuertes y a conquistar las mazmorras más poderosas.

Author Hotaru Yuyami has just tragically lost his beloved dog. While gazing at a tree in his yard, he notices a strange pink mushroom, and it's...moving?. The mushroom suddenly turns into an adorable dog, and Hotaru decides to take it in. Now, alongside his editor and a mushroom researcher, Hotaru shares heartwarming and hilarious moments with his new capricious companion.