The fatherdied, and Momoko, who was in the sixth grade of elementary schoolhad to leave the bustling metropolis of Tokyo with his mother Ikukoto live in Shishima, a port city near the strait. Before that, Taozi had quarreled with his father countless times, and even failed to say goodbye to his father after his death. Among the relics left by her father, there is a letter written specifically to her but never completed. Once a young, ignorant, self-willed and relentless words, Tao Zi could not regret it. She could not accept the fact that her father died suddenly, nor could she adapt to and integrate into life on the island.
On the other hand, Ikuko worked hard every day for her daughter, but quarrels broke out between her and Momoko from time to time. In the end, Yuzi fell ill in bed with exhaustion. While Momoko was extremely depressed, the three monsters Ayan, Agawa, and Xiaodouby suddenly broke into her home. Then a series of interesting and moving events happened.
