Mogeko Castle is a "prosciutto adventure game" made by Deep-Sea Prisoner in RPG Maker VX Ace.
It's not an RPG - there are no battles, and the story is totally linear.

Yonaka Kurai, an extremely ordinary high schooler. She takes the usual train home.
Though it's all ordinary, today is somewhat special. Today, her beloved brother comes home.
But after waking from a nap, the train has stopped at an unfamiliar station...

Deep-Sea Prisoner rates this game "ages 15 and up."
(This rating is Japan-centric and would likely be more strict by other countries' standards; 18 and up may be more appropriate.)

It is very violent and contains instances of implied sexual assault, with the bad endings being some of the most severe parts.
It also treats some serious topics like jokes, so I would strongly advise not playing if you think you may be upset by such content.
I do not support everything portrayed here. Deep-Sea Prisoner insists players should "keep reality and fiction separate."

(Content Severity: Severe)
Click here for content warnings.

Download Mogeko Castle 1.12 | (Mirror)
(Chrome may falsely flag the download as malicious, but it's safe to ignore.)

Installation of the RPG Maker VX Ace Runtime Package (not VX) is required to play.
Download VX Ace Runtime Package (RTP)

Supported Platforms
The game's engine is made for Windows only, with no native support for other platforms.
To play on Mac, you can try a general-purpose tool like WineBottler.

Usage Notes

Posting playthrough videos or doing live streams of Deep-Sea Prisoner's works is forbidden.
The sole exception to this is "translations in the form of a video," i.e. playing the game and live-translating to another language.

[1] Japanese rules page


Make sure to extract the game to its own folder instead of running directly from the ZIP file.
If you don't do so, any saves made will be lost the next time you run the game.

If you extracted the ZIP but save data is still being erased, try running the game as an administrator.
Without admin privileges, the game may not have permission to create save files.

"RPG Maker VX Ace RTP is not installed" means you need the RPG Maker VX Ace RTP.
This is distinct from the VX RTP which other games may require. The download link is up above.

Some have experienced crashes during the final chase scene in Chapter 6.
There are many objects in that map, so it most likely occurs because lower-end computers aren't able to handle it.
If it consistently crashes, download this save, copy it into the SAVE DATA folder, and load slot 20 to skip to after the chase.




Though the game is quite straightforward, there are two parts in particular which require some trial and error.
So I figured I'd be nice and give the answers here, if you want to "spoil" yourself.



Also, there are some things you might miss. (Spoiler warning!)


Translation Notes
(These contain spoilers for all aspects of the game. Only read after you've beaten it fully.)