Misora ​​and Yukari are step-siblings who end up living together during their impressionable teenage years. Both are Kokoro and find it hard to open up to each other, but the two, who had always wanted sisters, gradually become closer. However, due to their complicated family backgrounds, their relationship gradually becomes distorted. Misora, the older sister, cannot forgive her step-sister Yukari for monopolizing her mother's love, and her love continues to become twisted and distorted. Yukari, who is brave, loves Misora, who is beautiful and kind at heart.