One day, mother Akane was cleaning the bathroom without a bra. Her son Kohei had always said he didn't wear one because "it feels too tight," but Akane ignored his comments as usual. As she cleaned, Kohei couldn't take his eyes off her breasts, and gradually, Akane began to notice his gaze. Unable to contain himself any longer, Kohei suddenly sprayed water from the shower onto her chest. Soaked and translucent, her breasts were gently caressed by Kohei's hands. In that moment, their relationship changed forever.