Eri grieves because her pet cat was killed in a car accident.
But an angel appears and tells Eri that if he wants to revive a dead cat, he goes to Isekai to become a hero and defeat the devil and save the world.
Because Eri loves her cat, she has accepted the angel's offer and arrives at Isekai.
Isekai was an RPG world full of magic and fantasy, and Eri goes on a heroic adventure to revive her cat.
Raise the level and collect party members to start the RPG game to defeat the devil.

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