Embodiments of computers, non-transitory mediums having one or more computer programs stored therein, and methods are provided to enable multiple users of a video game to defeat a character in a fight. Embodiments of a computer device include, for example, a communication module, an enemy vitality management module, a fight application accepting module, an enemy vitality determination module, first mode execution module, a second mode execution modules, a first enemy vitality transmission module, and an enemy vitality updating module. Embodiments of the computer device operate in a first mode when a vitality number of a gaming character is greater than a predetermined value, and a second mode when the number is less than or equal to the predetermined value. Updates to the vitality number are enabled only in the first execution mode according to an embodiment of the invention.