The protagonist, Tanaka Ichiro, finds himself in a void-like room after dying, expecting to meet a goddess and receive cheat abilities for reincarnation. Instead, he encounters an old man who claims to be a god, currently filling in for the vacationing goddess. Ichiro, disappointed by the lack of a "sexy goddess," initially tries to leave but learns he can only go to heaven, hell, or reincarnate. He chooses reincarnation, but the old god is reluctant, citing a backlog of requests. Ichiro realizes the old god is the acting agent and forces him to proceed.
Ichiro's initial wish for invincibility, a harem, and a peaceful life in the frontier is immediately rejected due to lack of availability. After numerous rejections, he compromises on the harem aspect. The god offers a chance to become a goblin king, which Ichiro also rejects. Eventually, they agree to choose from available options. The world offered is Benales, a medieval-level world with magic, where humans and demons are at war, and human nations are also in conflict. The god offers a "game-like" system for managing the world, which excites Ichiro.
For the harem aspect, Ichiro is offered "Charm of the Enchanting Eye," which allows him to charm anyone under its influence. However, the severe drawback is that he will die if he has intercourse with anyone. Ichiro rejects this, but the god eventually offers "Nightmare Mode Harem Pack." This passive skill allows him to control defeated opponents and grow stronger through intercourse. The downside is that he loses all bonus points for other abilities and starts as very weak. He also learns that the effect is stronger with higher "hate" from the partner, and they will inevitably hate him afterward.
Ichiro is then abruptly sent to Benales. He wakes up as Leonardo, or Leon, in Ain village. He discovers the game-like menu system and his own weak stats, with exceptionally high Luck. He learns that intercourse is the primary way to grow stronger. He encounters Manya, the innkeeper's daughter, who is stronger than him. He challenges her to a "game" (rock-paper-scissors) to test his abilities, losing repeatedly and becoming her reluctant helper.
After days of losing, Leon finally wins a rock-paper-scissors match against Manya, activating his "Nightmare Mode Harem Pack" and making her unable to refuse him. He forces her to undress and attempts intercourse, but due to his inexperience and excitement, he climaxes before anything can happen. He gains some stats and a new title, "Clumsy Virgin."
Leon then targets Manya's older sister, Sala, a powerful spirit priestess. He uses Manya to incapacitate Sala with a potion and attempts to force himself on her. However, he again climaxes prematurely. Sala, despite being drugged and violated by Manya under Leon's orders, shows compassion and initiates intercourse with Leon, helping him grow stronger. This results in Sala's Luck stat decreasing and her gaining a "Fallen" status, while Manya becomes "Leon's Slave."
Leon continues to exploit Manya and Sala to gain power, aiming to become strong enough to protect them and eventually build his own harem. He learns about the world's rules and the importance of strength. He also discovers that his "Nightmare Mode" skill causes him to be hated by those he has intercourse with, though Sala seems to be an exception.
Later, Leon, now a level 7 "Himo... Super Himo!" with enhanced stats and new skills like magic and stealth, decides to leave the village. He encounters a bandit group led by Greg, who had previously attacked him. Greg's group ambushes Leon, but Leon escapes into a forest. He uses his skills to locate a hidden cabin and plans his revenge on Greg.
Leon's plan involves using his subordinates to attack caravans and acquire resources and women, all while adhering to a set of rules he established to manage his growing bandit organization. He aims to increase his power and skills by forcing intercourse with captured women, particularly those with useful skills. He also intends to use his subordinates as expendable tools to achieve his goals, including revenge for the destruction of the village and the deaths of Manya and her parents.
The narrative then shifts to Leon's perspective as he leads his bandit group to ambush a merchant caravan. He manipulates the situation to ensure his subordinates engage in combat, aiming to sacrifice some of them to achieve his objectives, including capturing women with valuable skills. He intends to use the captured women to further his own growth and eventually abandon his current subordinates. He also reflects on the rules of combat and the established customs between bandits and adventurers.
Leon's current goal is to capture specific women from the caravan who possess valuable skills, such as "Holy Magic," "Shadow Travel," "Swordsmanship," and "Item Box." He plans to use them to increase his own power and abilities, and potentially to further his harem ambitions. He also intends to use the caravan's resources and women to strengthen his organization and achieve his ultimate goal of establishing a secure base and living a life of leisure with a harem.
