CollarMalice is a thrilling simulation game developed by Idea Factory Co.Ltd, available for Android users. The game's story revolves around a series of gruesome murders that occurred in Shinjuku, which has turned into a dangerous city. You play as the protagonist, a police officer, who is attacked and fitted with a poisonous collar. The story takes a mysterious turn as you team up with a group of ex-detectives to solve the case.

The game features an interactive storyline with multiple endings, and the first part of the story is free to play, while the rest of the content requires in-app purchases. The game's graphics and sound effects are impressive, and the voice acting by famous Japanese voice actors, such as Yutaka Kobayashi and Daisuke Namikawa, adds depth to the characters. However, the game's performance may vary depending on the device's specifications.