Based on the true story of Fukushima Satoshi, a professor at the Research Center for Advanced Science and Technology at the University of Tokyo, who became the world's first deafblind university professor and his mother, Reiko. Reiko lives in Kansai with her teacher husband and three sons. The youngest son, Satoshi, who lost his sight at an early age grew up innocently surrounded by the love of his family and spent his high school life at a school for the blind in Tokyo but at the age of 18 he also lost his hearing. Tormented by loneliness in a world of darkness and silence, what gives Satoshi hope is a new means of communication, "Finger Braille", which Reiko devised from her daily life with him. Mother and child overcome difficulties one by one with courage and open up possibilities in life.