---
title: "Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~"
description: "Asuka Rin is diligently working toward her dream of debuting as an idol. The protagonist, Toki Yuzuru, supports her from close by, quietly watching over her eff"
image: "https://t.vndb.org/cv/71/128971.jpg"
---

# Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~

![Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~](https://t.vndb.org/cv/71/128971.jpg)

**Alternative Title:** スターライトBLUE ～幼なじみで推しの娘が知らないうちに開発されていた～

**Aliases:** スターライトＢＬＵＥ

**Developer:** LiLiM DARKNESS

**Release date:** Aug 29, 2025

**Platform:** Windows

**Language:** Japanese

**Rating:** 6.3/10 (40 votes)

## Description
Asuka Rin is diligently working toward her dream of debuting as an idol.
The protagonist, Toki Yuzuru, supports her from close by, quietly watching over her efforts.
Though the two are childhood friends who share special feelings for each other, they’ve chosen not to become a couple, prioritizing Rin’s aspirations instead.

Izumi Touya, the president of the production company Rin belongs to, tries to take advantage of her by dangling the promise of a debut. However, things haven't gone as he hoped.

One day, Yuzuru—who works part-time at the company—loses a USB stick containing important data he was entrusted with.
Held responsible, he finds himself in a difficult situation.
To protect Yuzuru, Rin resolves to accept Touya’s offer of a “special private one-on-one lesson” in exchange for her idol debut.

Until a few days ago, another trainee had been living with Touya in his home, but she has since left.
Now, Rin and Touya are alone together.
Despite her unease about the private lessons, Rin steels herself—for Yuzuru’s sake.

From that day forward, Yuzuru begins to notice Rin gradually changing... and can't shake the feeling that something is terribly wrong——.

## Characters
### Toki Yuzuru (土岐 譲)
He is friends with Rin since childhood.
Wanting to spend as much time as possible with his first love, Rin, he hides the fact that he is a childhood friend and applies to do odd jobs at Rin's production company.
He is in awe of Rin's efforts every day in preparation for her debut.
His hobby is computers, and he has recently been teaching himself video editing. He hopes to get a job in video production in the future.
He is unaware that Rin is living alone with Toya.

- **Gender:** Male
- **Measurements:** Height: 171cm, Weight: 63kg
- **Role:** Childhood Friend
- **Subject of:** Netori (their SO is stolen)

### Asuka Rin (飛鳥凛)
A girl who dreams of becoming an idol, inspired by her late mother who was a singer.
She has a cheerful and lively personality and is always at the center of attention in her class.
Currently, she's a trainee at a small talent production company, working hard on singing and dancing lessons.
However, her father, having witnessed the hardships of his late wife up close, is not very supportive of his daughter's pursuit of a career in entertainment. He allowed her to join the agency under the condition that if she doesn't make a major debut, she must go to college.
Now that her father has been assigned to work overseas, the official story is that she's sharing a place with another trainee, but in reality, she's renting a room at the home of the agency president, Toya.
Moreover, the trainee she had been living with has since quit, so she is now living alone with Toya.
Although she's aiming to debut as a solo idol, the harsh reality of the industry is beginning to make her feel increasingly anxious.

Likes: Her mother, who was a singer
Dislikes: Compromising

- **Gender:** Female
- **Measurements:** Height: 158cm, Bust-Waist-Hips: 88-59-89cm, E cup
- **Birthday:** 1 December
- **Hair:** Black, Waist Length+
- **Body:** Teen
- **Role:** Childhood Friend, Idol
- **Subject of:** Netorare (they are the stolen SO)
- **Voiced by:** Aoba Ringo

### Izumi Toya (和泉遠矢)
He originally gained popularity as a vocalist active on the internet.
Using the profits from that success, he founded a talent production company and began producing female idols while continuing his own activities.
He has already debuted several idol groups, and despite his young age, he's building a reputation within the industry as a highly skilled producer.
However, even during his time as a vocalist, he was infamous for getting involved with his fans.
He lets girls he takes a liking to live in his home, seduces them with his smooth, experienced ways, and then toys with them. He employs his ex-girlfriends and casual flings at his company.

- **Gender:** Male
- **Measurements:** Height: 176cm
- **Birthday:** 4 January
- **Hair:** Short
- **Body:** Young-adult
- **Role:** Not a Virgin, Executive, Producer
- **Engages in:** Netori (steals the SO)

## Shops
- [Official Website](https://s-digi.jp/lilim/02_soft/02_darkness/11_sb/index.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=1373819)

## Releases
### Japanese
- **2025-08-29**: Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~ Regular Edition - [Official website](https://s-digi.jp/lilim/02_soft/02_darkness/11_sb/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=38543), [Getchu](http://www.getchu.com/soft.phtml?id=1330792)
- **2025-08-29**: Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~ Deluxe Edition - [Official website](https://s-digi.jp/lilim/02_soft/02_darkness/11_sb/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=38543), [Getchu](http://www.getchu.com/soft.phtml?id=1330793)
- **2025-08-29**: Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~ Download Edition - [Official website](https://s-digi.jp/lilim/02_soft/02_darkness/11_sb/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=38543), [DMM](https://dlsoft.dmm.co.jp/detail/sai_0062/)
- **2026-09-18**: Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~ DVDPG - [Official website](https://hobicolle.com/detail/?t=772), [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=3768848), [Getchu](http://www.getchu.com/soft.phtml?id=1373819), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=hcdp209/)

## Tags
Netorare, Idol Heroine, Protagonist's Childhood Friend as a Heroine, Only a Single Heroine, Male Protagonist, ADV, Nukige, Executive Hero, Single Blowjob, Vaginal Masturbation, Missionary Position, Defloration, Sounds of Copulation, Playboy Hero, Heroine with Gradient Colored Hair, Dildos, Production of Pornography (Amateur), Flashback, Anal Sex, Idol Protagonist, Hidden Vibrator, Vibrators, Defloration by Others, Cowgirl, Condoms

## More Games from LiLiM DARKNESS
- [TRUE BLUE](https://pinovel.net/v2069)
- [ANGELS BLUE](https://pinovel.net/v1888)
- [Innocent Blue](https://pinovel.net/v2068)
- [True Blue Short Story](https://pinovel.net/v2731)
- [Triangle BLUE](https://pinovel.net/v2697)
- [Dark Blue](https://pinovel.net/v2715)
- [Wedding Blue](https://pinovel.net/v10462)
- [HUNTING BLUE](https://pinovel.net/v12973)
- [Triangle Blue Additional Short Stories](https://pinovel.net/v15457)
- [Dearest Blue](https://pinovel.net/v19024)
- [White Blue](https://pinovel.net/v25376)
- [Memory Blue](https://pinovel.net/v38875)
- [Starlight Blue ~Osananajimi de Oshi no Ko ga Shiranai Uchi ni Kaihatsu Sareteita~](https://pinovel.net/v55873)
- [PRIDE BLUE ~Ore no Aishita Hokoritataki Reijou wa, Chichi no Shihai no Naka de Ochiteiku~](https://pinovel.net/v59421)

---
*View the full details at [pinovel.net/v55873](https://pinovel.net/v55873).*

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