御城プロジェクト:RE (macOS)

Last Updated: Jun 25, 2026 Developer：DMMGAMES

Play 御城プロジェクト:RE on PC and Mac

Oshiro Project: RE (ShiroPro: RE), developed by DMMGAMES, is a simulation RPG that blends castle personification, character training, and tower defense strategy into a single full-featured experience. Set against the backdrop of Japan's Sengoku period, the game tasks players with commanding a roster of beautiful castle girls who stand as humanity's last defense against an invading army of monstrous helmets. With over 650 personified castles from Japan and around the world, deep affection systems, and high-quality pixel art battles, it offers a layered experience that rewards both casual players and dedicated strategists. Playing Oshiro Project: RE on PC through MuMuPlayer brings all of this to a larger screen with a more comfortable setup.

The game's core appeal lies in its fusion of genres. Tower defense battles demand careful thinking around unit formation, positioning, and the timing of tactical skills, while the training side of the game lets players build bonds with castle girls by offering gifts and unlocking story events as affection levels rise. Every single castle girl has her own voiced events, performed by a star-studded cast that includes Mamiko Noto, Sayaka Ohara, Rie Kugimiya, Yui Horie, Kana Asumi, Marina Inoue, and many other well-known voice actors. The variety of castle girls spans famous Japanese fortresses as well as international landmarks like Neuschwanstein Castle and Prague Castle, giving the roster an impressive global range.

Running Oshiro Project: RE through MuMuPlayer on PC gives players a meaningful upgrade in comfort and control. The larger display makes it far easier to track unit placements and enemy movements across the battlefield, while keyboard and mouse support streamlines the management of over 650 castle girl cards and their individual upgrade paths. Long training and bond-building sessions become less tiring without the need to hold a phone, and MuMuPlayer's stable performance helps keep pixel art battles running smoothly even during the most action-heavy stages. For a game that rewards sustained attention and precise timing, the PC experience through MuMuPlayer is a natural fit.

About the Game

Oshiro Project: RE, also known as ShiroPro: RE, is a genre-blending mobile RPG from DMMGAMES that combines the strategic depth of tower defense gameplay with a robust character cultivation system built around personified castles. The story unfolds in a fictionalized Sengoku-era Japan where the Battle of Sekigahara has just concluded and peace seemed within reach. That hope is cut short when a brutal army of monstrous beings known as helmets emerges, overwhelming human forces with ease. The only figures capable of standing against them are a special group of girls born from the collective desire to protect the people. These are the castle girls, and they become the foundation of everything the game offers.

At its heart, the gameplay experience in Oshiro Project: RE revolves around two interlocking systems. The first is the tower defense battle system, where players deploy castle girls onto the field and must think carefully about placement, formation, unit sizing, and the precise moment to activate each character's unique tactical ability. Battles are rendered in high-quality pixel art that brings every skirmish to life with charm and visual clarity. The second system is the bond and training mechanic, which gives each castle girl her own growth trajectory. Sending gifts raises a girl's affection level, and as that level climbs, special story events unlock that reveal more about her personality and background. Importantly, these events are not limited to a select handful of characters. Every castle girl in the game has her own voice-acted story content available to experience.

The roster itself is one of the most impressive aspects of the game. Players can recruit and develop more than 650 castle girls drawn from real historical fortresses, spanning well-known Japanese landmarks as well as internationally recognized structures. The variety means players will encounter characters inspired by everything from Himeji Castle and Osaka Castle to Neuschwanstein Castle and Prague Castle, with each girl designed to reflect the spirit and heritage of her real-world counterpart.

Voice acting plays a major role in bringing this cast to life. The game features contributions from a remarkable lineup of performers, including:

Eriko Nakamura as Osaka Castle
Yui Ogura as Nagoya Castle
Sakura Tange as Prague Castle
Mamiko Noto as Himeji Castle
Yui Horie as Jurakudai Palace
Kana Asumi as Inuyama Castle
Marina Inoue as Neuschwanstein Castle
Sayaka Ohara as Azuchi Castle
Rie Kugimiya as Shizuki Fushimi Castle
Ayana Taketatsu as Forbidden City

This level of vocal talent gives the game a premium feel and ensures that time spent on bond events is genuinely rewarding rather than simply a numbers progression.

Oshiro Project: RE is well suited for players who enjoy character collection RPGs with real strategic depth, fans of tower defense games who want more than mechanical repetition, and anyone drawn to the idea of building relationships with a large and diverse cast of voiced characters. The game is free to play and covers a wide range of interests, from Sengoku history enthusiasts to fans of anthropomorphic character design and popular voice actor performances.

For those looking to get the most out of the experience, playing through MuMuPlayer on PC is a practical choice. Managing a roster of over 650 castle girls is considerably smoother on a full-sized monitor with mouse support, and the expanded screen real estate makes battle positioning far more readable. The overall session comfort also improves significantly, allowing players to engage with longer story events and training sequences without the physical strain of extended mobile play.