Professional bodyguard Riichi is employed to protect the son of the leader of a large conglomerate and takes his work incredibly seriously. One day, he's tasked with coaching Tachibana, a rookie new hire, who unfortunately has no money and no place to go. Opening his home to the new employee, Riichi is taken aback by Tachibana's brashness... and his endless flirting! Just who is this mysterious new coworker and what's his problem? Unpredictable Newbie x Cool Beautiful Senpai, an epic love story between an odd pair!