Information storage medium and game system

A non-transitory computer-readable information storage medium storing a program for causing a game to progress by reducing a compensation parameter by a consumption amount set for a game medium and setting the game medium to be in a useable state, the program causing a processor to:

• increase the compensation parameter to up to an upper limit of a predetermined value when a predetermined increase condition, generated playing the game, is satisfied;
• store a normal game medium in which the set consumption amount is equal to or less than the predetermined value, and a special game medium in which the set consumption amount is more than the predetermined value in a storage medium as the game medium in association with a player;
• reduce the compensation parameter by a given reduction amount and increases an accumulated parameter in accordance with the reduction amount;
• and
• set the special game medium to be in the useable state by reducing the compensation parameter and/or the accumulated parameter so that a sum of a reduction amount of the compensation parameter and a reduction amount of the accumulated parameter together is equal to the consumption amount set for the special game medium.