Slit Mouthed is a first-person horror film based on a long-standing Asian legend about a woman with a slit mouth. The story tells us about a writer who was obsessed with researching Japanese folklore. On this basis, according to witnesses, he went crazy, often saying that something would kill him. Some time later, he was found dead on his estate with his mouth cut from ear to ear. The police determined that it was a suicide, but many people are sure that he was killed by the demon Kuchisake-onna – the same woman with a terrible mutilation on her face. The hero will play the role of an ordinary security guard, who was tasked with guarding the writer's property at night, before it is sold to a new owner.

Slit Mouthed takes place at night in a large Japanese-style house consisting of several floors. As you progress, you will have to explore the house, looking for answers to the mysteries and your missing partner. It will be extremely difficult to do this, since there is no light in the estate, and you will have to wander around the unknown building in almost complete darkness with only a flashlight. To advance through the plot, you need to solve various puzzles and text riddles, as well as look for keys, heals and other items. The horror game has three endings available – good, neutral and bad.