Akoya, the eldest son of a wealthy family Watanuki, and his younger sister, Zakuro. For some reason, they live in a small house far away from the mansion, just the two of them. Akoya is a painter who dedicated his life to paint the pure Zakuro. Zakuro admires her brother who paints about her, and loves him with from the bottom of her heart.

However, Zakuro has a secret she cannot tell to Akoya......

[Translated from the official website]