Five years ago, alien beings known as the Kiseichuu'' invaded the world. With the species endangered, the Kiseichuu are determined to take over Earth through a deadly plan that would gradually wipe out the human race: take away humanity's sexual drive using various methods, letting them die out. In response to the Kiseichuus' scheme, the HxEros device was developed—a powerful weapon that only those with high levels of erotic energy can utilize at its maximum capacity. Retto Enjou, a high schooler harboring an immense hatred toward the Kiseichuu, joins a group of HxEros users to fight against them and protect humankind. With their gear reliant on erotic energy as a source of power, the team must work together to maintain high levels of libido to ensure their readiness for combat at any given time. Moreover, as he lives in a house full of lustful girls, Enjou should not expect a shortage of power anytime soon.

Xiao Yan, the best Xiao family fighter ever. At the age of 4, he began his training, at 10 he already owned the ninth level of strength, and at 11 - the tenth, so he became the youngest fighter in the history of his family. But at the age of 12, something unpredictable happened: he lost almost all of his strength. For the next three years, neighbors mocked him and even broke off his engagement. It would seem that nothing will help him, but then a spirit appeared from his ring, which showed him the way to power. Xiao Yan again became a favorite of the family and the crowd, but this could not satisfy his ambition. To avenge the failed wedding, he goes to the mountains and, with the help of an old herbalist, becomes stronger and stronger.

Tang San is one of Tang Sect martial art clan's most prestigious disciples and peerless in the use of hidden weapons. With high expectations, the sect's elders believe his future will be bright; yet Tang chooses to forsake this life at the cost of obtaining the sect's forbidden lore—an action punishable by death. Tang, now content with his ascension of knowledge, sees no reason to keep on living and jumps from Hell's Peak, but little did he know that that would not be the end of his existence. In Douluo Continent, the strong prevail and the weak perish. Each person possesses an innate spirit, some of which can be cultivated and strengthened, bestowing its user with various benefits. Those who were born with such spirits can become Spirit Masters, a profession regarded as one of the continent's most noble. Tang, reincarnated into this strange world, knows only the life of a blacksmith's son. At the age of six, he takes part in the Spirit Master ceremony, and discovers his spirit is Blue Silver Grass—supposedly the world's most useless spirit. In contrast, however, he possesses strong spirit power. Now, aided by the memories of his previous life as well, Tang's future as a Spirit Master is in no way bleak.

To obtain the Magic Flame, Xiao Yan and his teacher went to a desert full of snakes, which angered the Master of the Snake Tribe, Yue Mei. When Xiao Yan was on the very edge of death, he was rescued by the Master of Fight, whose face was hidden by a mask. As it turned out, he was also looking for the Magic Flame. The Snake Tribe refused to hand over the Magic Flame to the Master of Fight, but when he attacked the Queen of the tribe, it turned out that it was just a shell, and the real queen is preparing to absorb the Magic Flame in order to become the God of Fight. The Snake Tribe attacked those who dared to raise their hand against their queen, while Xiao Yan was able to find traces of the Magic Flame in the midst of the battle and hunt down the Queen...