The Hidden Dungeon Only I Can Enter~

Ore Dake Haireru Kakushi Danjon

The Hidden Dungeon Only I Can Enter OVA Series

M-rated Version

Chapter 3 Beach Day

Summary: The events that transpire in this particular story. Is during vol.6 of The Hidden Dungeon Only I Can Enter light novel.

The chapters going forward in this OVA fanfiction story are basically like fanfiction bonus chapters of the vol.6 light novel. So be warned, if you don't wanna be spoiled.

These next chapters will be showing references and spoilers of vol.6 of the Hidden Dungeon Only I Can Enter light novel. So please support the official release and enjoy the story, thank you.


It was one o'clock in the afternoon, and I invited Master Olivia, Alice, Emma, Luna, Lola, Leila, and Nell. If they wanted to have a fun beach day afternoon on the bonus floor of the Unending Dungeon.

Along with exploring the tropical island that inhabits the bonus floor too. Besides, I wanna celebrate after saving my master.

We were currently hanging out in the plaza. The others were patiently waiting for me to explain why I brought them all here so suddenly.

"I wanted to invite you all to the beach to show my appreciation. Especially to Emma, Luna, Lola and Leila. If it weren't you ladies I would've gotten myself killed by the fake Olivia and my master would still be trapped in the Unending Dungeon."

"It was our pleasure Noir, you dozen of times before. We were just returning the favor." Lola said as she reached out and tapped me on the nose. Her cute side is the secret to her popularity as a Receptionist in the Odin Adventure Guild.

"Yeah that's what friends are for, you big dummy." Emma said with a jolly smile on her face as she looped her arm around my own. In a warm embrace.

"Thank you very much," Noir said in a sincere tone.

"We would love to join you. We could all use a little fun and relaxation today." Luna said.

I definitely use a break from healing and breaking curses in the church. Some attendants recommend resting once in a while. Luna thought.

"You don't mind if my younger brother joins us too, right Noir?" Leila responded.

"Of course not, the more the merrier. Besides, I shouldn't keep all you beautiful ladies for myself all the time."

Noir complimented them and they instantly started blushing with the same facial expression.

"So what are waiting around here for let go to beach Noir. I'm ready to have fun in the sun! Olivia said excitingly with her starlight eyes shining bright.

"Wait, don't we need our swimwear and other accessories too?" Alice announced to everyone.

Usually, adventurers and travelers tend to swim in rivers and lakes with their bikini and swimming trunks.

There are also pools at nobles and rich people's mansions. So regular bikinis and other swimwear weren't unusual in our world.

"Oh right, then let's meet back at my house, once you get your bikinis. I already got the tents, food, drinks, a cooler, and grill inside my Pocket Dimension." I came well-prepared for this beach day.

"Very we'll be back soon Noir. With the cutest and alluring bikinis you could possibly imagine." Emma said as she waved her hand goodbye and left with a spring in her step. The others left in different directions too.

"I can't wait," Noir murmured with a sly grin on his face as he imagined the girls in their skimpy and sexy bikinis, playing in the water.


An hour later everyone appeared outside of Noir's house with their backpacks, stuffed with their own bikinis, swimwear, and other essential items.

"So is everyone ready to go?" Noir asked his friends just in case they didn't forget anything important.

"Nope, we are ready to go Noir," Emma said confidently, while the others nodded with agreement.

"Alright, just remember to keep the Unending Dungeon a secret from anyone else. We don't want an overly entitled nobleman to claim rights over the Unending Dungeon or something."

Noir warned everyone as he used the Dungeon Elevator to transport everyone into the bonus floor. "Yeah we promise Noir, your secret is safe with us," Luna said as she walked through the Dungeon Elevator, alongside everyone else.

We passed through the Dungeon Elevator and onto a sandy beach with a tropical jungle a couple of spaces behind us.

The white beach spread from the sea to as far as the eye could see. The sun glitters in the cerulean-colored sea, sparkling lights dance off the surface.

The beach was also covered with corals and small shells lying around us. They would make good souvenirs I think.

"Wow it's so beautiful," Emma said, while she walked around on the white beach, her eyes were stolen by the sea that stretched out before her.

"It has been a while since we went on a mini vacation together, big brother," Alice said to Noir as she reached out and held her older brother's right hand.

Olivia, Lola, Luna, Leila, and Nell walked along the sandy beach while feeling the sea breeze. Emma followed along afterward, part way through she loosened her boots and ran on the sand barefoot.

"Hot! Hot! Hot! Hoooot!"

Well of course it's hot down here. The sun shines brightly overhead.

It was hard to comprehend that this place was part of the dungeon. Despite it feeling like a tropical island.

Emma was dancing a weird dance, she kept jumping from foot to foot as she ran toward the cool sea to escape the heat.

This place could be used as a private resort. I already checked the colorful jungle and there aren't any dangerous monsters here.

Except for animals like multi-colored iguanas, rabbits, seagulls, parrots, wild boars, hutias, and ocelots.

So this bonus floor looks safe enough for us. Since we are super powerful enough to handle a small predator.

Walking along the beach shore. While Olivia, Alice, Emma, Luna, Lola, Leila and Nell. Were all barefooted playing against the waves. As the waves rose and splashed they frolicked enjoying it.

"It's cold and feels so good." Olivia said while moving her gently around the seawater. Enjoying the cool sensation between her toes.

While everything else was having fun playing in the water. I used my Pocket Dimension on the beach and took out the cooler box, gill, towels and two large tents so the boys and girls could change their clothes separately.

The girls went immediately to change and Emma popped her out and responded to both me and Nell. "No peeking, Noir!" Emma said as she winked her right eye with a teasing expression on her face.

"I would never!" Noir said while fidgeting after she teased him.

Having reached the sea we decided to have a swim before preparing the barbecue grill.

Eventually, me and Nell went to boys tents to go into our swimming trunks. I was wearing simple dark green swimming trunks while Nell was wearing jet black swimming trunks.

Later, everyone got out of the tents after they finished changing. "Sorry for the wait boys, let's swim," Emma said while wearing a white halter-neck bikini top and white triangle- shaped bikini bottoms. A type of swimwear where the shoulders were tied to the neck.

Her ample bust that was normally hidden under clothes moved with her every step.

I was troubled as to where to look while her breasts were shaking and guttering under the sunshine.

Seeing all the ladies in their beautiful and sexy bikinis gave me 14,000 LP. This beach day was so it. But when I stood in front of her with my well-toned muscles. Emma spun toward me and Nell.

"How's the view, boys?"

"Sorry, I'm so sorry, I couldn't resist." Noir and Nell said simultaneously and nervously started to stare straight down at the sand.

"Mufufu."

"Seeing that surprised look on you guys faces was totally worth it." Noticing the movement of my gaze Emma covered her mouth with her hand and laughed with satisfaction.

"Oh yeah I heard it before!? It's super popular with the girl adventurers." Lola said while enjoying the shocked look on Noir and Nell's faces. "It's a greeting used to stop boys from leering at girls."

"I told you guys it would work. Noir couldn't resist leering at a girl with a sexy bikini on. It's one of his top five weaknesses." Emma said with her hand on her hips with a proud expression on her face.

"Oh Noir aren't you being a little inconsiderate? Don't leave me alone out here. I want your undivided attention too." Alice said while puffing her cheeks with a cute expression on her face.

Alice was wearing a pink halter-neck bikini top and pink triangle-shaped bikini bottoms. I thought she was going to wear her school swimsuit, I guess she grew out of it.

"Let go, everyone! Let's leave think of lewd things to himself." Emma said as grabbed Alice and looked at Noir with an eye tongue gesture. "BLEHH." Then she walked towards the aquamarine sea.

"Heyy-! I wanna join too." Noir shouted.

"You should swim on your own, pervert!" Emma while hiding her bouncing large breasts.

"Ahahaha!" Olivia laughed out loud and responded to Emma. "Come on, don't say that! My apprentice is sometimes an idiot, but he's a man too." Olivia continued her sagely advice. "Someone who doesn't get excited seeing us like this, deserves to die painfully death anyways."

"Yeah I know. Its just cute how he pleads innocently like that." Emma replied.

"Wait before we go into the sea we should all do our stretches. We don't wanna get a foot cramp while playing in the water." Leila said, warning everyone not to get into the water yet.

We agreed with her and decided to do our warm-up exercises on the beach. Facing towards the sea, one-two-three, one-two-three.

Luna gently rotated her wrists and ankles, stretched legs tendons again and started to enter the sea. While wearing her black halter-neck bikini tube top and black triangle-shaped bikini bottoms.

Lola joined her best friend, running towards the sea, wearing a green halter-neck bikini top and a red triangle-shaped bikini bottoms.

Then Olivia took my hand and pulled me into the water with her and the cold caused Olivia to exclaim; when we splashed water on each other like children.

I guess even Olivia is a child at heart, despite living for so many years.

Leila was the last one to join us and enter the sea after finishing her warm-up exercises. She was wearing a purple halter-neck bikini and purple side-tie bikini bottoms.

Then Olivia suddenly responded. "Oh yeah that reminds me, I have beach chairs, parasols and beach balls in my Pocket Dimension." Olivia used her Pocket Dimension and pulled out a beach ball.

"We can play a little game together and where the winner gets to spend a little quality time with Noir." Olivia suggested her idea to the other girls and all their eyes began to sparkling with excitement.

"That sounds like fun." Lola said with a smirk on her face.

There's no way I'm gonna lose. Luna thought

"I'm gonna sit this one out. I just saw Leila and Nell making sandcastles together and I wanna join them too." Alice said as turn her back and walked towards the beach shore.

"I'm gonna join you too. Since this competition is between the girls." Noir said as he waved back to his younger sister.

Then Luna questioned Olivia. "Anyway, what type of game are we playing and what are the rules?"

"How about we play "Monster Icebreaker." This is how the game works. We pass the beach ball around and the one holding on to the beach ball gotta name a monster and she can't she's out." Olivia said as she explained game introductions.

"Okay everyone get ready cause I'm about to serve the beach ball."

"Bring it on Olivia, me and Noir, are gonna have a romantic beach day together once I win this mini game." Emma said, feeling quite confident.


The girls began throwing and bouncing the beach ball around each other for about thirty minutes. Occasionally the beach ball would hit on their boobies and untie bikini tops.

Where me and Nell sneaked a peek when they weren't looking.

Meanwhile me, Alice, Nell and Leila were having a sibling sandcastle competition.

"Here's our sandcastle, it has towers on the outside." Nell said as he displayed the

large sandcastle to his older sister.

"Cool! But, those are actually called turrets." Leila corrected her younger brother.

"I put a gate in the front, too." Nell said as he pointed to the sandcastle.

"Portcullis, Nell." Leila replied.

"And finally, these cool arch thingies on the side, here."

"Those, my dear brother, are known as buttresses." Leila said with an accurate and affirmative voice.

"You're a buttress Leila." Nell said with a sly look on his face.

"Well its looks like we lost the sandcastle contest, dear brother." Alice said with a sulking look on her face.

"Hey there always next time Alice." Noir replied, doing his best to cheer his little sister up.

Finally, Emma won the beach ball game and I agreed to spend some time with her.

"Come everyone, its about time we had lunch." Olivia said feeling hungry, after playing that beach ball game.

"Okay!" I replied to my master, as the others prepared the beach chairs, beach towels, parasols and barbecue grill.

Eventually me and Emma each grabbed ourselves a seasoned meat and mushroom skewer. As we walked peacefully side by side on the beautiful beach shore.

Once we finished our meal I responded. "Oh man, I had more fun than I could possibly imagine." Noir said with a bright smile on his face.

"Same here Noir, I had a great time with everyone, there is just one last thing to make it special." Emma said while blushing and swaying her body side to side.

"Really, huh? Does it start with a K' and ends with a S'." Noir said with a teasing tone in his voice.

"You guess right, my sweet Noir, and here is your award for bringing me to this wonderful beach." Emma replied as her eyes moved gently in front of Noir.

Emma moved slightly. I felt a soft and warm sensation touch my lips. We stayed that way for a moment before we moved apart.

Wow, that kiss in the mouth; from Emma gave me 7,000 LP. Mmm, probably because it felt romantic with the sun and beach shore right behind us.

"If you keep this up Emma, I think I'll fall head over heels in love with you." Noir said with a joyful smirk on his face.

"Hey, sorry to interrupt you two love birds but while you were having a romantic moment together. I found a huge shipwreck floating on the ocean." Olivia explained to Noir and Emma.

"Won't you're serious Master?!" Noir said with a surprise expression on his face.

"Yeah, its a far distance away from the beach. We should check it out, there might be glorious treasure inside, ripe for the taking." Olivia said with sparkles of greed in her eyes.

"That sounds good to me, Master but how are we supposed to get there without a rift or boat?" Noir said, thinking that the shipwreck might be a lost opportunity.

"Oh sweet naïve Noir, I'm pretty sure that I have a large boat inside my Pocket Dimension." Olivia said confidently while teasing her gullible apprentice and giving Noir adorable head pats.

"Well what are we waiting for? Let's go treasure hunting, like pirates of the seven seas." Emma said, feeling quite excited and eager for an adventure on the ocean.