Shelly is the mayor of the Animal Village, which receives a getaway package to a deserted island from Tom Nook along with other people from the village. When they arrive, however, they find out they are trapped in the island, and Tom Nook announces a "killing game" where you have to kill someone and not get caught to escape. Shelly now must find ways to escape the island, while solving murder cases and finding the culprit in each one of them to survive. Some will kill, others will be killed.

[From itch.io]