曾經, 有一個人類與Monster共享繁榮國家, 叫做MonsterPia.

十數年前, 由於大災禍的降臨, 有傳除了一部份的Monster以外, 整個國家都被毀滅了, 但是....

"Monster還活著!" "集齊所有Monster的話, 什麼願望都可以實現哦!" 有關MonsterPia的謠言不知什麼時候開始在人們之間散佈開來....

"我真想集齊所有Monster呢..." 作為Monster訓練員的你, 和青梅竹馬的Mina踏上往MonsterPia旅程!

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