The ceiling collapsed and a girl fell through from the second floor!? Sousuke lives in a rundown apartment building where his only consolation is that the landlord is a beautiful woman and the girl who lives above him is cute. One day though, the ceiling above him creaks and... Bang! In from the second floor, directly above him, the cute girl comes crashing down on him…!? In an erotic encounter that can only be classified as a miracle, hearts and bodies are connected by chance. Then for some reason, he starts to live with both of these beautiful women!? Under this one roof, just what exactly will become of this crowded love triangle...!? (Source: Honey's Anime)

Takane Takamine is great at everything she does, and her magnetic personality makes her the envy of everyone. She gets good grades, excels at sports, and even manages to become student council president during her first year of high school. But Takamine has a secret—she possesses an ability called Eternal Virgin Road, allowing her to redo past actions and achieve a different result. While this might seem like a decent skill to have, Takamine must pay a price to activate it: she has to strip off a piece of her lingerie. After getting an imperfect score on a test, Takamine begins to remove her underwear during class and is spotted by her average and weak-willed classmate Koushi Shirota, who is bewildered by the sight. However, the very next instant, things reset and Takamine's test is now perfect. When Shirota decides to confront Takamine about her previous test score, she reveals her ability to him and blackmails him into becoming her closet, making him carry around extra lingerie and put them on her. Her goal is to be able to use Eternal Virgin Road as much as possible in order to stay at the top of the school hierarchy. Left with little choice in the matter, Shirota accepts, starting an oddly intimate type of relationship with the most popular girl at school.

Surrounded by four armies of dark beasts, five humanoid races strive to push the known boundaries of the world. Unfortunately, the 13 heroes dispatched to the southern region are easily wiped out by Clevatess, one of the Lords of Dark Beasts. Determined to get revenge against humanity, Clevatess bursts into the capital of the Kingdom of Hiden, leaving a trail of death and destruction behind him. Although the situation looks desperate, humanity still has a chance to appease Clevatess' anger. Alicia Glenfall, one of the 13 heroes, is revived by Clevatess to help him raise a newborn infant, Luna, whose choices shall shape the fate of the human world. Although reluctant to help the dark beast at first, Alicia understands that Luna is the only thing that stands between humanity and complete annihilation. Hiding himself by taking on a human form, Clevatess sets out in search for a wet nurse with Alicia and Luna. With Clevatess unwilling to reveal his identity, it falls on Alicia to slay all enemies that stand in their way. Meanwhile, the neighboring countries prepare to advance on the weakened Hiden, aiming to control the only forge capable of producing the heroes' weapons.

The tropical Seiren Island is a paradise for deviants: the infamous Pervert Law grants near-complete sexual freedom with almost no taboos or boundaries. With its various suggestive attractions, the Seirantou Health Organization (SHO) entices visitors while providing regular medical checks and contraceptive pills to ensure carefree enjoyment. However, for high school student Junnosuke Tachibana, the island is far from ideal. Having recently moved there with his younger sister, Asane, he cannot stand the empty, loveless sexual acts. To make matters worse, Junnosuke's abstinence attracts unwanted attention—and those who defy the law face punishment. Junnosuke soon crosses paths with Nanase Katagiri, a notorious island seductress. Surprisingly, instead of forcing herself on him, she helps him flee from the SHO. Together, they discover a secret group that exists for a singular goal: to destroy the SHO. Now equipped with a way to resist the unjust rules, Junnosuke and other kindred spirits set out to crush the Pervert Law.