Collar × Malice

Collar × Malice follows a rookie police officer Ichika Hoshino stationed in Shinjuku, Tokyo. On her way home from work, she is attacked and a collar with poison is placed around her neck; following this, she becomes involved with the "X-Day Incident", a string of murders done by a terrorist group called Adonis. Under the threat of death, Ichika is forced to investigate the X-Day Incident together with a group of former police officers.

The game was developed by Idea Factory, as part of their Otomate brand of otome games. It was announced along with twelve other otome games during the annual Otomate Party event in August 2015, and was released in Japan on August 18, 2016, for PlayStation Vita. To promote the game, merchandise based on it was released prior to the game's launch, including audio dramas and a tapestry with a Collar × Malice illustration.

At Anime Expo 2016, Aksys Games announced that they would localize the game and release it in North America in 2017; in April 2017 they announced that it would also be released in Europe, and be available both digitally and physically. It was released on July 28, 2017, in North America and Europe. A fan disc, Collar × Malice: Unlimited, was released in Japan in 2018. Both the original game and Unlimited are planned to get released for the Nintendo Switch in North America and Europe with the original planned for release on June 25, 2020, and August 2020 respectively.

Collar × Malice's sales numbers for its debut week differ between different sales charts: Media Create reported that it was the eleventh best selling video game of the week with 7,271 copies sold, while Famitsu reported that it was the eight best selling with 9,406 copies sold. Siliconera described the Japanese opening week sales as good for a PlayStation Vita visual novel for a niche audience.

The game received "mixed or average reviews", according to the review aggregator website Metacritic. Famitsu's reviewers praised the graphics and character art, and enjoyed the player character's developing relationships with the other characters. One of them liked the suspense, commenting that it is rarely used in otome games.