Riona Minami, a rookie student council secretary, is a lesbian secretly in love with student council president Ayumu Sena. Day after day, she indulges in masturbation while fantasizing about Ayumu. One day, Riona returns to the student council room to retrieve her forgotten wallet—and discovers Ayumu masturbating while calling out her name. This fleeting encounter becomes the turning point that changes both of their destinies, capturing the moment when pure affection and hidden desires are etched into their hearts.