Maken X is a sword with a unique ability called brainjacking. It can take over the mind and body of another creature and adapt all its strength and weaknesses. Maken X is also the hero of the game - a wandering mutant spirit of the sword. The ability to manipulate a person's "psi", or soul, was discovered in a research lab. The chief scientist is kidnapped by terrorists and his daughter Kay awakens Maken X who now must assist her on her dangerous mission.
In Maken X , players control a first-person action game with an emphasis on melee combat. The player can control the minds and bodies of thirteen characters they meet during their journey. Each character has their own attacks, advantages, and disadvantages. Throughout the game, the player must make decisions that will influence the plot and bring the game to one of its seven endings.