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December 11th, 2025
SmileBoom Co. Ltd.

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SmileBoom Co.Ltd.   The person in charge: Nobuki Nagai, Akari Tsuruta
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Programming-Free RPG Creation Tool for PC “RPG Developer Bakin”
 New Sample Game from Creator MAKOTO KEDOUIN
“REINES DU SABBAT Queen of Sacrifice.” Revealed
SmileBoom Winter Sale Now Live — “RPG Developer Bakin” 20% Off!

December 10, 2025 - Sapporo, Japan – SmileBoom Co.Ltd. announced today that it has released new information on “REINES DU SABBAT Queen of Sacrifice.,” a new sample game currently being developed in RPG Developer Bakin (hereafter, “Bakin”) by game creator MAKOTO KEDOUIN.
In addition, the “SmileBoom Winter Sale” begins today. Until 10:00 AM PST on Thursday, December 18, 2025, “RPG Developer Bakin” will be available at 20% off, with various DLC offered at 10–35% off.

Latest Updates on MAKOTO KEDOUIN’s New Project “REINES DU SABBAT Queen of Sacrifice.”!

KEDOUIN, the creator behind the popular horror game Corpse Party, is currently developing a new sample game using Bakin. New details regarding the worldbuilding, characters, and overall setting of “REINES DU SABBAT Queen of Sacrifice.” have been published on the official website.
“REINES DU SABBAT Queen of Sacrifice.” is a work in which game creator MAKOTO KEDOUIN has reconstructed, using Bakin, the prologue of his earlier title “REINES DU SABBAT,” originally created as his debut work with the game-making tools available at the time. Once completed, it will be released for free as a Bakin sample game. In addition, the game’s full project data and assets are planned to be included in Bakin at no extra cost. This will allow Bakin users not only to study the internal structure as sample data, but also to make active use of it in their own game development.
Ahead of the full release, today we are pleased to share a glimpse of the game, including its story, characters, and participating creators. You can also follow the development process on the official dev blog, “Made with RPG Developer Bakin.” Please take a look.

■“REINES DU SABBAT Queen of Sacrifice.” Special Page

https://rpgbakin.com/en/products/reines-du-sabbat-queen-of-sacrifice/

■ Story

A young noble girl, raised in comfort and without hardship, becomes a wanderer overnight.

Meanwhile, a forsaken child hidden away by the Church escapes from its underground cells.

One girl, once part of a family charged with “judging the guilty,” suddenly becomes the hunted.
The other, freed from the chains that bound her life, steps into the world for the first time.

Together, the noble girl and the forsaken child begin walking on their own feet—
their journey guided by a shared hope for a land of happiness.

What fate awaits these two travelers?

■ Characters

Falmire von Trikia
Daughter of Selvein, Count of Trikia.
A noble girl raised within the refined world of the upper aristocracy.
Loved by her father, cared for by her maids and the family’s butler, and cherished by the people of her domain, she grew up bright and carefree.
Though still a child, she inherited her father’s uncompromising dislike for “crooked” ways.

Carcell Luminarie
A maid serving the household of Count Selvein.
At times a dependable older sister to the mischievous Falmire, and at others a gentle teacher in place of a mother, Carcell has long supported and watched over the Trikia family with devotion.

Parfi
A mysterious girl whom Falmire encounters at a forest spring.
Her skin, hair, and eyes are all pale and translucent white.
Though unable to speak, her gentle smile brings comfort to Falmire.

Count Selvein von Grail Trikia
Lord of the Trikia domain within the Royal Capital of Enbican.
His residence lies in Snowfield, a town surrounded by mountains and forests.
Admired by his people for the just rule he enforces, he is also a deeply devoted father who treasures his daughter.

■Participating Creators

◆ Chief Director

MAKOTO KEDOUIN
A Japanese game creator and scenario writer from Amagasaki City, Hyogo Prefecture. Gained attention during student years for the self-developed horror game “Corpse Party”, initially released as a doujin (indie) title before being commercialized. The Corpse Party series has since expanded beyond games into novels, drama CDs, and anime, earning critical acclaim both in Japan and abroad.
Renowned for crafting intense, emotionally resonant stories that delve deep into the human psyche—often in genres such as horror, suspense, and coming-of-age ensemble dramas. Known especially for distinctive horror presentation and psychological depth, the works have attracted a loyal fanbase.
Continues to actively release new titles in both games and novels. Emphasizes starting with the story first when developing a project, often incorporating personal experiences and emotions into worldbuilding.
Note: “Corpse Party” is a work by Team GrisGris. “Corpse Party BR, BS, 2U, BD, TP” are also copyrighted works by Team GrisGris/MAGES.

◆ Logo Design

Norihisa Kochiwa
Game producer.
He has worked on a wide range of content, mainly games and music, and has released over 100 console titles.

Message:
I’m Kochiwa, and I had the pleasure of creating the title logo.
I’m really looking forward to seeing how Mr. KEDOUIN’s previous REINES DU SABBAT is reborn through BAKIN!

◆Character Design

Nao Shirahane
Illustrator.
She began her career as a manga artist, but now primarily works on game illustrations.
She was actively involved in doujin activities until a few years ago, and though currently on a break… she’s itching to get back into it!

Message:
I’m excited—and a little nervous—to see how the characters I drew will live through the story. I’ll be watching them over with anticipation, so please look forward to it! 🙏🏻 (Seriously)

◆Sound

Mao Hamamoto
Sound composer.
After graduating from Osaka University of Arts, Department of Visual Arts, he worked at K Company and S Company before becoming freelance.
He is currently active as part of Team GrisGris.

Message:
I had a lot of fun composing the music. Please enjoy and immerse yourself in the new world of SABBAT!

■ “REINES DU SABBAT” Development Blog: Made with RPG Developer Bakin

https://rpgbakin.com/en/blog/made-with-bakin/

■ “REINES DU SABBAT Queen of Sacrifice.” Game Overview

  • Title: REINES DU SABBAT Queen of Sacrifice.
  • Genre: Mystic Adventure
  • Recommended System Requirements:
    OS: Windows10 (64bit), CPU: Core i5-8400/Ryzen 5 1500X or better, Memory: 16GB, Graphics: NVIDIA® GeForce™ GTX1650/AMD Radeon™ RX570, Storage: 500 MB available space
  • Distribution Site: RPG Developer Bakin Official Website
  • Number of Players: 1
  • Online Support: Not Supported
  • Supported Languages: Japanese, English and Simplified Chinese (Traditional Chinese support planned for a later date.)
  • Price: Free
  • Scheduled Release Date: December 2025
  • Development: MAKOTO KEDOUIN / SmileBoom Co.Ltd.
  • Publisher: SmileBoom Co.Ltd.
  • Special Page: https://rpgbakin.com/en/products/reines-du-sabbat-queen-of-sacrifice/
  • Copyright Notice: ©2025 SmileBoom Co.Ltd. / Original Work by MAKOTO KEDOUIN

 

SmileBoom Winter Sale 2025

Starting today, we are offering a 20% discount on "RPG Developer Bakin."
Additionally, DLCs containing various resources will be discounted by 10% to 35%, and the SmileBoom Winter Sale 2025 discount will be applied to bundle editions including the products on sale, making them even more affordable. Don't miss out on this opportunity!

●SmileBoom Winter Sale 2025 Overview

  • Period: Wednesday, December 10 – Thursday, December 18, 2025, at 10:00 AM PST
  • Eligible Products & Discounts:
    • RPG Developer Bakin: 20％OFF
    • Paid DLC: 10% to 35% OFF
  • Note: Some DLCs are not included in the sale. Please check the Steam News page for details.
    URL：https://store.steampowered.com/news/app/1036640/view/510724876254840527
  • Bundle versions that include discounted items will reflect the same individual discounts.

Release of “Mokemo Factory MONSTER PIXEL PACK Complete Collection”

We are pleased to announce that the “Mokemo Factory MONSTER PIXEL PACK Complete Collection”—a deluxe bundle containing all volumes of “Mokemo Factory MONSTER PIXEL PACK Vol.1–5”—goes on sale today.
It features 100 pixel-art monsters across a variety of themes — dinosaurs, animals, spirits, undead, machines, and more.
Each monster comes with color variations and three outline styles (none / black / color).

Additionally, the SmileBoom Winter Sale 2025 discount will be applied until 10:00 AM (PST) on Thursday, December 18, 2025, making it an even better value during the sale period.

● Bundle Edition Overview

  • Title: Mokemo Factory MONSTER PIXEL PACK Complete Collection
  • Contents: 5 types of paid DLC（Mokemo Factory MONSTER PIXEL PACK Vol.1〜5）
  • Steam Store: https://store.steampowered.com/bundle/62141/
  • Release Date: December 10, 2025
  • Price: $79.95→$71.96 USD (Bundle discount: 10% off)
  • Note: If you already own items within the bundle, you can purchase only the items you don't own at the bundle discount price.

About RPG Developer Bakin

"RPG Developer Bakin" is a game creation tool that combines ease of use with powerful features. It makes it simple for anyone to create games inspired by "your world." It includes a map editor that allows you to create maps as if you were playing a game; an event creation system that controls the game by arranging panels with functions; a database that provides detailed character status settings; and advanced screen effect settings that can dramatically alter scenery. It also provides many other tools. Graphics and sound assets are also provided so you can start creating your game right away. The tool launched on Steam in October 2022 and has continuously improved and expanded based on creator feedback. Following ongoing feature enhancements and additions, the official version was released on August 28, 2025.

Factsheet