My father is scheduled to go on a long-term business trip next week for trade-related work, and my mother's "Kana" is saddened by the business trip, but her son's "Tadashi" has always been predicting this timing. "But", who has been aware of her mother as the opposite sex for a long time, enjoys her life alone while peeking at her mother's nakedness and taking voyeurism. Tadashi sees her mother crying in the middle of the night and decides to seriously support Kana as a man.