The protagonist, Akari Hanano, idolized the Tsukimori Triplets, the school's idols.

There was Chiya, the cool eldest; Hiyori, the gentle second; and Karin, the optimistic third.

Akari was content just to admire them from afar.

However, a classmate, mistaking her devotion for romantic feelings, forced Akari to confess to the Tsukimori Triplets. She was rejected, losing not only her love but also her place in the class.

To add insult to injury, her parent's remarriage meant Akari would now be living under the same roof as the Tsukimori Triplets. Her new life as their stepsister was expected to unfold into the worst possible scenario, but Akari gradually began to bridge the distance between herself and the triplets.

A shared life where she would be doted on by the triplets was about to begin.

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