Asahura Nagi is a rookie insurance saleswoman struggling to meet her targets, facing daily frustration over her poor performance. One day, a bold client makes her a suspicious offer: "If you take care of my son, Shota, I'll consider signing the contract." Desperate to secure the deal, Nagi agrees to babysit him. However, Shota instantly falls for her and begins aggressively making sexual advances. As Nagi finds herself increasingly overwhelmed by Shota's naughty pranks, the situation spirals further into chaos.