---
title: "DeepOne -Ryoukai Shinpan-"
description: "\"Is that feeling a curse or love?\"  A strange calamity known as the \"Fallen Child\" has appeared in Kamimizu-ryu. There are those who resist the unprecedented cr"
image: "https://t.vndb.org/cv/03/105803.jpg"
---

# DeepOne -Ryoukai Shinpan-

![DeepOne -Ryoukai Shinpan-](https://t.vndb.org/cv/03/105803.jpg)

**Alternative Title:** DeepOne-領界侵犯-

**Aliases:** DeepOne Desecration

**Developer:** Nameless

**Release date:** Jul 25, 2025

**Platform:** Windows

**Language:** Japanese

**Rating:** 7.4/10 (41 votes)

## Description
"Is that feeling a curse or love?"

A strange calamity known as the "Fallen Child" has appeared in Kamimizu-ryu.
There are those who resist the unprecedented crises that have repeatedly befallen them, among those there are Itsukino Naoya, Hinamori Saya, Itsukino Ichika and Fujinomiya Atsushi.

They perform a "Purification Ritual" to subdue the Fallen Child, however,
the "Purification Ritual" comes with a cursed "price".

"We have confirmed the Seahorse invasion. We will now subdue the breach of our territory."

With the Fallen Child looming before his very eyes, Naoya wields his "immortal power."
With each battle and each defense, more losses follow.
Yet, his resolve to protect his town and his comrades remains unwavering, even if it means losing something more precious than his own life.

"I won't let that happen."

A strange girl appears before Naoya, who is giving everything he's got and pushing forward towards his destiny.
But the girl knows something... she has come all the way here to meet him.

"This time, I will save you."
"Even if you hate me..."

The Blue Witch, Kasumi Yuuki.
Meeting her will change Naoya's destiny.

[Translated and edited from [DMM](https://dlsoft.dmm.co.jp/detail/next_0449/)]

## Characters
### Itsukino Naoya (斎野 尚哉)
- **Gender:** Male
- **Aliases:** つきの, Tsukino, なおやん, Naoyan
- **Measurements:** Height: 169cm, Weight: 68kg
- **Birthday:** 24 May
- **Hair:** Brown, Short, Multicolored, Spiky Bangs, Shaggy
- **Eyes:** Brown, Amber, Heterochromia, Tsurime
- **Body:** Teen, Slim, Pale, Olive, Large Penis
- **Items:** Sword
- **Clothes:** Jacket, T-shirt, Sports Shoes, Hoodie, Suspenders, Capri Pants
- **Personality:** Ore, Protective, Honest
- **Role:** Twin Brother, Older Brother

### Fujinomiya Atsushi (文示宮 篤)
He is the next head of the Fujinomiya family, a family with a status second only to the main Itsukino family.
Intelligent, cool-headed, and possessing a charismatic aura belying his age.
A childhood friend of Naoya and Ichika, he serves as the commander of the purification squad, which performs purification rituals.
Due to the feud between the families, he tends to keep his distance from Naoya in normal times, but as a child, he was a timid boy who clung to Naoya and Ichika.

While he performs missions alongside Naoya, Ichika, and the others on the surface, his true feelings remain hidden beneath his cold, ostentatious glasses.

- **Gender:** Male
- **Measurements:** Height: 178cm, Weight: 72kg
- **Birthday:** 1 May
- **Hair:** Red, Short, Straight, V Bangs, Parted to Side
- **Body:** Slim, Pale, Young-adult
- **Role:** Magician
- **Eyes:** Grey, Hosome
- **Clothes:** Glasses, Gloves
- **Personality:** Ore, Smart, Charismatic
- **Items:** Book
- **Voiced by:** Onomura Shintarou

### Furalanelu (フルララネル)
- **Gender:** Unknown
- **Measurements:** Height: 168cm, Weight: 53kg, Bust-Waist-Hips: 94-60-80cm, H cup
- **Birthday:** 1 November
- **Eyes:** Green
- **Role:** Maid
- **Clothes:** Maid's Dress, Maid's Headdress
- **Hair:** Grey
- **Voiced by:** Tenjou Shinoka

### Garm (ガルム)
- **Gender:** Male
- **Measurements:** Height: 163cm, Weight: 47kg
- **Birthday:** 13 August
- **Hair:** Blond
- **Body:** Tattoo
- **Clothes:** Hoodie, Pet Collar
- **Eyes:** Cyan
- **Voiced by:** Mie Kanade

### Gentle Ani (ジェントル・アニー)
- **Gender:** Male
- **Measurements:** Height: 190cm, Weight: 78kg
- **Hair:** Pink, Violet, Multicolored
- **Eyes:** Amber
- **Clothes:** Ring, Feather Boa, Multiple Earrings
- **Personality:** Flamboyant
- **Body:** Lip Piercing

### Hinamori Saya (比奈森 沙耶)
Yamato Nadeshiko who serves as the guardian and caretaker of Naoya and Ichika.
However, despite her delicate and elegant appearance, she is a skilled swordsman unmatched in her family and though she appears to be a young girl, her exact age is unknown.

Since ancient times, she has offered absolute loyalty and selfless devotion to the Itsukino clan leader.

She is both a sword teacher and a mother figure to Naoya.

- **Gender:** Female
- **Measurements:** Height: 142cm, Weight: 38kg, Bust-Waist-Hips: 69-52-73cm, AA cup
- **Birthday:** 29 October
- **Hair:** Black, Hime Cut, Waist Length+, Straight, Blunt Bangs, Sidehair
- **Body:** Slim, Pale, Kid, Younger Appearance, Flat Chest
- **Eyes:** Green, Tsurime
- **Items:** Katana
- **Personality:** Refined, Watakushi
- **Role:** Yamato Nadeshiko
- **Voiced by:** Kusuhara Yui

### Itsukino Ichika (斎野 一花)
A shrine maiden who was destined to protect the Kamimizu School alongside the head priest of Itsukino.

She has been in charge of the Kamimizu-ryu Shinto rituals since ancient times, and is known to the townspeople as "Hanahime-sama."
While she is respected, she is usually fun and a carefree, positive girl who has a crush on her older brother, Naoya.

She loves her big brother and is a spoiled brat.

- **Gender:** Female
- **Alias:** イツキノ イチカ
- **Measurements:** Height: 158cm, Weight: 50kg, Bust-Waist-Hips: 95-63-86cm, H cup
- **Birthday:** 24 May
- **Hair:** Violet, Shoulder-length
- **Body:** Teen, Big Breasts
- **Role:** Twin Sister
- **Voiced by:** Nanakusa Yuuka

### Nancy (ナンシー)
- **Gender:** Unknown
- **Measurements:** Weight: 4kg
- **Eyes:** Green
- **Role:** Cat, Familiar
- **Voiced by:** Suzuki Every

### Rosalia Lombardo (ロザリア・ロンバルト)
- **Gender:** Female
- **Measurements:** Height: 138cm, Weight: 28kg, Bust-Waist-Hips: 66-47-68cm, AA cup
- **Birthday:** 14 February
- **Hair:** Blond, Twin Braids
- **Eyes:** Amber, Jitome
- **Clothes:** Habit
- **Voiced by:** Hinata Yuka

### Yuuki Kasumi (佑姫 カスミ)
The main heroine of this work.

A mysterious girl who suddenly appears in Naoya's time of need and saves him.
She always carries with her a grimoire modeled after a black cat familiar called "Nancy."

She is competitive and confident, and is the epitome of a genius.
However, she often makes devilish remarks to Naoya, causing him trouble.

Although she is wary of Fujinomiya Atsushi, She is accepted by Ichika and Saya and she ends up living with the Itsukino family.

- **Gender:** Female
- **Measurements:** Height: 168cm, Weight: 54kg, Bust-Waist-Hips: 86-58-82cm, E cup
- **Birthday:** 21 December
- **Hair:** Ponytail, Wavy, Ringlet, Spiky Bangs, Parted to Side, Sidehair
- **Body:** Teen, Slim, Pale, Big Breasts
- **Role:** Magician, British
- **Personality:** Confident, Atashi
- **Eyes:** Teal
- **Clothes:** Ribbon Hair Tie, Ankle Boots
- **Voiced by:** Kamishiro Misaki

### Nancy (ナンシー)
- **Gender:** Female
- **Hair:** Pink, Waist Length+, Wavy, Blunt Bangs, Hikimayu, Sidehair
- **Body:** Teen, Slim, Pale, Kemonomimi, Fur, Magic Tattoo, Furry Tail
- **Eyes:** Green, Tsurime, Symbol
- **Role:** Servant, Spirit, Cat
- **Engages in:** Shapeshifting
- **Clothes:** Tank Top, Detached Sleeves, Ribbon Tie, Clothing with Ribbons, Hair Tie, Garter, Ankle Socks, Crop Top, Pleated Skirt, Puffy Sleeves, Microskirt, Mary Jane
- **Personality:** Energetic, Loyal
- **Voiced by:** Suzuki Every

### Yato Sayataka (八戸 莢貴)
- **Gender:** Male
- **Measurements:** Height: 177cm, Weight: 63kg
- **Birthday:** 29 February
- **Hair:** Brown, Shoulder-length, Spiky Bangs, Shaggy
- **Body:** Teen, Slim, Pale
- **Eyes:** Amber, Tsurime
- **Clothes:** Necktie, Shirt, Sports Shoes, Hairpin, Headphones
- **Role:** Friend
- **Personality:** Third Person
- **Engages in:** Breaking the Fourth Wall
- **Voiced by:** Haru Danji

## Shops
- [Official Website](http://nameless.nexton-net.jp/game/d2/)
- [Getchu](http://www.getchu.com/soft.phtml?id=1327292)

## Releases
### Japanese
- **2023-07-26**: DeepOne - [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34117), [PlayStation Store (JP)](https://store.playstation.com/ja-jp/product/JP0741-CUSA26451_00-DEEPONEZZZZZZZZZ)
- **2023-07-27**: Deep One - Regular Edition - [Official website](http://nameless.nexton-net.jp/game/do01cs/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34118), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=1889513), [PlayAsia](https://www.play-asia.com/13/70g3c7)
- **2023-07-27**: Deep One - Regular Edition - [Official website](http://nameless.nexton-net.jp/game/do01cs/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34117), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=1889511), [PlayAsia](https://www.play-asia.com/13/70g3c3)
- **2023-07-27**: Deep One - Limited Edition - [Official website](http://nameless.nexton-net.jp/game/do01cs/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34117), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=1889510), [DMM](https://www.dmm.com/mono/hobby/-/detail/=/cid=storeghb002053k7aupbezo/), [PlayAsia](https://www.play-asia.com/13/70g3c9)
- **2023-07-27**: Deep One - Limited Edition - [Official website](http://nameless.nexton-net.jp/game/do01cs/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34118), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=1889512), [DMM](https://www.dmm.com/mono/hobby/-/detail/=/cid=storeghb00205mj3i7e3kms/), [PlayAsia](https://www.play-asia.com/13/70g3cf)
- **2023-07-27**: DeepOne - [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=34118), [Nintendo (JP)](https://store-jp.nintendo.com/item/software/D70010000062242)
- **2025-06-13**: DeepOne -Ryoukai Shinpan- Trial Edition - [Official website](https://nameless.nexton-net.jp/game/d2/)
- **2025-07-25**: DeepOne -Ryoukai Shinpan- - [Official website](http://nameless.nexton-net.jp/game/d2/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=31886), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=2894939), [Getchu](http://www.getchu.com/soft.phtml?id=1327292)
- **2025-07-25**: DeepOne -Ryoukai Shinpan- Download Edition - [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=31886), [DMM](https://dlsoft.dmm.co.jp/detail/next_0449/)

## Tags
Protagonist with a Face, Maid Heroine, Few Choices, Linear Plot, Multiple Endings, Loli Heroine, Male Protagonist, Twincest, Protagonist's Younger Sister as a Heroine, Blood-related Brother/Sister Incest, Protagonist's Twin as a Heroine

## More Games from Nameless
- [Deep One](https://pinovel.net/v22499)
- [DeepOne -Ryoukai Shinpan-](https://pinovel.net/v32797)

---
*View the full details at [pinovel.net/v32797](https://pinovel.net/v32797).*

```json
{"@context":"https://schema.org","@type":"VideoGame","@id":"https://pinovel.net/v32797#game","name":"DeepOne -Ryoukai Shinpan-","description":"\"Is that feeling a curse or love?\"  A strange calamity known as the \"Fallen Child\" has appeared in Kamimizu-ryu. There are those who resist the unprecedented cr","url":"https://pinovel.net/v32797","image":"https://t.vndb.org/cv/03/105803.jpg","author":{"@type":"Organization","name":"Nameless"},"aggregateRating":{"@type":"AggregateRating","ratingValue":"7.4","bestRating":10,"worstRating":1,"ratingCount":41}}
```