Individuals with Momotarou and Oni blood coursing through their veins maintain a longstanding rivalry. The Oni are careless, rash, and disorderly, while the Momotarou protect the human world from the uncontrollable Oni. Shiki Ichinose is a reckless and irresponsible teenager, aware of his defiance and even proud of his expulsion from school. Despite Shiki's rebellious attitude, his foster father, Tsuyoshi, cares about him deeply. Tsuyoshi's selfless love is soon shown in an explosive incident when a Momotarou barges in looking for Shiki. As a Momotarou himself, Tsuyoshi has been hiding Shiki for years and keeping his Oni origins a secret even from him. As he gives up his life to save Shiki and confesses everything in his dying breath, Shiki's Oni blood awakens for the first time, transforming him into an unruly monster overflowing with rage and a thirst for revenge. Shiki's momentary outburst attracts the attention of Naito Mudano, an Oni teacher at the Rakshasa Academy—an institution for young Oni in need of understanding and perfecting their powers. Before Shiki can avenge his father, he must learn to control his headstrong and impulsive nature and, above all, fight against his own demonic blood.

When Light is kicked out of the Concord of the Tribes, his former comrades instantly turn on him. Light escapes this diabolical act of betrayal by the skin of his teeth...only to find himself in the deepest part of the Abyss, the most dangerous dungeon in the realm! To avoid being eaten by carnivorous monsters, he uses the Unlimited Gacha, his sole magical skill. But where it previously only produced junk items, this time Mei—a gorgeous Level 9999 fighter in a maid outfit—springs forth! Fast forward three years and Light has carved out his own kingdom in this backwater dungeon, summoning more beautiful Level 9999 warriors who swear absolute fealty to him. Now a powerful Level 9999 Overlord himself, Light plans to ascend to the surface and take revenge on his betrayers one by one!

Lingwu Continent is a world where spiritual power and martial spirit coexist. A spiritual cultivator can move mountains and rivers with a thought, and a martial artist can tear the world apart with bare hands. Chen Tian, ​​a former genius in Xingchen Town, lost his martial spirit and dried up his spiritual sea after he turned ten. Since then, he has become a waste of his family and has been looked down upon by others. In a life-and-death struggle, Chen Tian fell off a cliff and mistakenly entered the formation arranged by the ancient sword emperor. Under the influence of the power of the heavenly book, he awakened his spiritual and martial dual cultivation physique. At the same time, he also obtained a strange memory and a mysterious storage ring. From then on, he rose from adversity, broke through the reincarnation of the Heavenly Dao Palm, and finally crossed the shackles of the emperor's calamity and aspired to become the champion of Lingwu Continent!