This movie was based on the novel "Bloody Crayons".
As graduating students, they decided to go to an island to shoot for a short film project. In this island, the old summer house of Olivia's family was built which was believed to have unsettled spirits haunting at night. They need to stay here while shooting the film in which the caretaker Mang Pedring is also assisting them on their needs.
Later, the trouble started when Olivia discovered that his boyfriend Kenly had a secret affair with Marie which caused her to get mad and even get disappointed with Eunice, her close friend that acts as the guardian of the team who also kept the secret after discovering it couple of weeks ago. Olivia tried to avoid them all which also caused some problems while shooting their project. However, she later joined the team claiming that she's not angry anymore and ready to finish the short film.
One night, the team decided to play a game called Bloody Crayons in which each color has different consequences about honesty, rules, and many more. It was fun at the beginning but it gets more serious when few things are revealed. The last one who can get the red crayon will drink all the stuffs placed on the plastic glass where the name Bloody Crayons was derived.
When Olivia got the chance to request for a consequence, she asked Kenly to kiss her without malice and as a sort of closure which will have permission from Marie but the kissing did not happen after Olivia cut it.
One night, they decided to play the Bloody Crayons game and everyone got excited. Some sanctions of the game are funny and some are dangerous in the sense that they don't know the impact of it. Unfortunately, Marie got the last red crayon which means that she needs to drink the mix but she's game for it. While drinking it, she felt uncomfortable with the taste and started to vomit. Olivia suggested to give her water from Marie's own tumbler but it worsened the scenario that resulted to her death.
The team panicked and started to blame Olivia for a suspected poisoning as revenge. Olivia escaped and ended to fall off the cliff. This is where the horrible things happened when Kenly was slit to death in his neck so each one is suspecting one another causing them to kill each other and die also from the rage of the killer.
With the terrible things happening, Eunice, John and Kiko stayed protecting themselves. Olivia also came back claiming that she didn't die in the cliff but this made them suspect her as the killer. John also discovered that there is a secret passage near to the cliff which was possibly used by Olivia.
It was later revealed that her target are only Kenly, Marie and Eunice but since others are killing each other, it lessened her burden. Kiko was later killed and Eunice tried to escape near the cliff where she encountered the angry Olivia wanted to kill her as the last. Luckily, John is still alive and he saved Eunice from Olivia. Olivia fell off finally at the cliff after asking forgiveness from Eunice which ended the horrible scenario at that night.