Atobe Lengetsu, Atobe Keigo's "sister", has an enviable background but never reveals it, just to help her younger brother at critical moments. In her heart, his responsibility is to make her younger brother happy, in order to compensate for her younger brother in the previous life.
Atobe Keigo, the heir to the Atobe family, but everyone knows that his sister is better than him but he is willing to give it to her favorite brother, and his brother only shows his true emotions in front of his sister...
When worlds collide, what kind of sparks will be created?