Mai Maisaka is a 14-year-old girl reincarnated from another world where she served as a martial artist hero battling a demon king. She now lives in modern Kyoto with fellow former heroes in a candy store inherited by art student Kumi Honamanuma. Adapting to contemporary life, Mai lost her original combat abilities and embraced new aspirations.

Once dedicated solely to martial arts in her fantasy world, she now actively trains to become an idol in peaceful Japan. Mai builds her public presence as an entertainer through maintaining a blog and participating in live events, her daily activities centered on typical idol promotional work.

Her personality blends friendliness with shyness, projecting a kind demeanor suited to her new life. She contributes to household duties like cooking, demonstrating practical skills developed after reincarnation.

When the reincarnated demon king Ran seeks help gathering scattered demon king fragments, Mai joins her housemates on the mission. This involvement connects her current existence to her heroic past, though the story prioritizes her present identity. Mai juggles her commitment to idol pursuits with these residual hero responsibilities; the narrative explores both without favoring one over the other. Her development focuses on adapting to modern life while occasionally confronting elements from her previous world.