The sun‑kissed Seiren Island is a haven for the unconventional: under the notorious Pervert Law, sexual liberty reigns without limits or prohibitions. The island"s alluring venues draw guests, while the Seirantou Health Organization (SHO) offers routine medical examinations and contraceptives to keep pleasure worry‑free. The island"s culture, built on uninhibited enjoyment, clashes sharply with Junnosuke"s own principles.
For high‑schooler Junnosuke Tachibana, the island feels alien. Relocating with his younger sister Asane, he despises the hollow, emotionless encounters that dominate. Worse still, his choice to abstain draws unwanted scrutiny—anyone who challenges the law faces retribution.
Soon Junnosuke meets Nanase Katagiri, a famed island temptress. Instead of coercing him, she aids his escape from the SHO"s watchful eye. Together they uncover a clandestine faction dedicated to toppling the SHO, planning to infiltrate its data centers and broadcast its secrets. Armed with a method to oppose the unjust decree, Junnosuke and like‑minded allies embark on a mission to dismantle the Pervert Law.
