["Japanese Psychological Research, EarlyView. ", "\nAbstract\nEmpirical demonstrations of the overexpectation effect in human learning are scarce. This study provides further evidence for the utility of a role‐playing game (RPG) task as a methodological tool in associative learning research. RPGs, in which participants assume the role of a character in a fictional setting, offer an interactive and engaging context for examining learning processes. Two experiments with university students tested whether the overexpectation effect—a reduction in responding to a cue when two previously reinforced cues are compounded and followed by the same outcome—could be observed in an RPG‐based task. In both experiments, the effect was demonstrated, indicating that the RPG task can capture this benchmark phenomenon in human participants. These findings provide further support for prior research, demonstrating that the RPG‐based task not only reproduces classical associative effects but also offers a flexible and ecologically valid approach for translating complex animal learning procedures into human experimental contexts.\n"]