R-18 Island
R-18 Island is an island making its first appearance in Episode 8 of Hyperdimension Neptunia: The Animation. As the name suggests, this island is restricted to where only people eighteen and over can enter.
Geography
R-18 Island's geography has a tropical forest with two mountains separate from the island, a resort, and a nude beach.
Story
Hyperdimension Neptunia: The Animation
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The Paradise (Island) Forbidden ...on which people will DO THINGS to other people and forget wardrobe malfunction because there might even be some tonguing and it'll be like "Oh no, Neptune is so embarrassed~~"!
The CPUs and Nepgear fly to R-18 Island to scout for an artillery battery present that was detected by Lowee's satellites within the island. As they arrive, the CPUs change into their swimsuits due to its strict dress code. Vert stares and points out Plutia and Blanc's chest size and speaks her thoughts about how she wonders if the two will pass as adults, annoying Blanc in the process. Neptune settles the matter by saying that age doesn't apply to goddesses. Vert, Neptune, Noire, and Nepgear manage to enter the island without a problem, but Blanc and Plutia were met with resistance by the security interface due to their chest sizes. Irritated, Blanc destroys the interface to gain access. Inside, the group are back on their human forms, and they come across Linda, a supposed guide. The group recognizes her from before, so Linda explains that she's making an honest living. The group trusts her, so Linda leads them in a beach full of nude women, whose lewd body parts are covered by Mysterious Light Grasses. In order, Neptune, Vert, Plutia, and Nepgear disrobe their swimsuits and play in the beach. Due to Blanc and Noire not wanting to strip, Neptune uses light grasses to make them look like they're naked and tells them to actually undress. Before Noire considers to undress herself, Blanc uses her weapon to create a wind towards the "nude" CPUs, exposing that the light grasses only create a mirage effect to make them look naked. Noire points out that she saw Neptune undress, but she reveals that it was only a mirage. Nepgear actually removed her swimsuit and accuses Neptune while feeling embarrassment. Nearby, Linda takes out a brown glass container object and grins.
The group eventually indulges themselves in activities. Noire and Neptune play volleyball, Blanc builds a sandcastle, Plutia builds a colossal sand version of a Neptune doll, and Vert spreads wax over Nepgear's body. Then Linda arrives with iced tea for the group. As Neptune takes the first drink, Linda smirks to herself. Neptune reacts after drinking and becomes embarrassed from others looking at her. Vert concludes that it might be due to a drug that maximizes shyness, so the group stares at Linda. Linda tries to deny that it might be her fault, but a drug container slips out from her pocket. Blanc tries to confront Linda, but a subtle but vexed Plutia gets in between them and reminds Linda that she was suppose to be an outstanding citizen. In reply, Linda states that she's a natural-born villain. Plutia transforms into HDD form and plans to teach Linda a lesson. Linda tries to run away, but Plutia catches up and punishes Linda.
After being set straight, Linda shows the group the artillery battery. Neptune doesn't remember anything from what happened to her. Plutia says that Neptune was so cute, sending shivers down Neptune's spine. Arriving at the guns, the "artillery battery" is actually a huge bubble machine, blowing multiple amounts of bubbles. The bubble guns stop for a moment and aims in the air, leaving the rest wondering what will happen next, but it only blew more bubbles. Noire sees a momentary figure of Anonydeath before disappearing quickly. She dismisses it as her imagination and assures herself that he's in prison at the moment.
The Challenge (Rebellion) of Eden
The CPUs and Nepgear arrive to the island once again to investigate a new nation that has been formed. Anonydeath then welcomes the CPUs to the newly established nation, Eden. Black Heart retorts that Eden doesn't even have a CPU and attempts to aim her weapon at him, when suddenly a blonde-haired girl in a white suit falls on Black Heart, who then introduces herself as Yellow Heart. Black Heart tells her to get off of her and Yellow Heart begins to get serious to fight the Hearts. Yellow Heart does well to hold her ground but is eventually beaten back to reveal that she is Peashy.
Other Appearances
Hyperdimension Neptunia The Animation: DNA Comic Anthology
R-18 Island makes an appearance in Chapter 10. After the CPUs tell Uni, Rom and Ram that they are still children when asked why they're not allowed to go, the three sneak into the island without notice. As Uni decides to strip naked, the twins join in, but get stopped by Abnes.
Abnes tells Rom and Ram this island is dangerous and suggests them to go back home. Uni then attacks Abnes by wrapping her face with mysterious light grass and the three make an escape. Uni enters into a forest, but ends up losing the twins. Abnes surprises Uni and tells her that she was the one who brought the twins to the island.
As Uni calls a truce with Abnes, the two hear the screams of Rom and Ram being captured by CFW Trick. Uni transforms into HDD and defeats Trick to save the twins and apologizes for making them come with her.