Mogeko Castle

Mogeko Castle is Deep-Sea Prisoner's first game, developed in RPG Maker. It was released on April 1st, 2012 on RPG Maker 2000. A remake made in RPG Maker VX Ace was released in early 2014.

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...