Kana's father is scheduled to go on a long business trip next week for a trade-related job, and her mother, Kana, is sad about the business trip, but her son, Tadashi, has been waiting for this opportunity. Tadashi has been aware of his mother as a member of the opposite sex for a long time, and he enjoys living with her while peeking at her naked body and taking secret photos. When Tadashi peeks at his mother crying alone in the middle of the night, he decides to seriously support Kana as a man.