A game processing system according to an aspect is a game processing system for processing a game having a first mode and a second mode, the system comprising: a storage storing a game parameter relating to the game; and one or more computer processors. The one or more computer processors execute computer-readable instructions to: provide, in the first mode, an interaction with a virtual character in accordance with first detection information obtained by an information processing device not mounted on a head of a player; provide, in the second mode, an interaction with the virtual character in accordance with second detection information obtained by a head mounted display mounted on the head of the player; and update the game parameter in accordance with progress of the game in the first mode and the second mode.