A young man named Yuji was born as the second son of three brothers. His mother Saki had always thought he was quiet and shy, but... one year, his older brother got a job and moved out while his younger brother went to a boarding school. Their father was busy working away from home, leaving just Yuji and Saki living together. As their once lively household became quieter, Saki felt a sense of loss. Seeing her motherly instincts unfulfilled, Yuji began to feel regret and emptiness for not being able to fully support his family. He tried to receive all of his mother's love and affection by himself, leading him down a path of self-discovery and intimacy. Note that the recording contents may vary depending on the distribution method.