Kenji, born as the second son of a three-sibling family. From his mother, Saki's point of view, he was an easy-to-raise child... One spring, his older brother got a job and lived alone, and his younger brother entered a boarding school. His father's life changed busily with a transfer, and a mother-son life of Kenji and Saki began. The lively house suddenly became quiet, and Saki felt a sense of loss... Seeing his mother like that, Kenji felt regret and emptiness that she only cares about her sons, and tries to feel his mother's love all to himself...
