Mari Kudoh and his ally Yoichi are known as the 'handymen' for their ability to tackle any task. However, their routine is disrupted when Mari's younger brother Miyuki, who is also Yoichi's partner, pleads for their help to protect Miyuki's friend, Yu Kaitoh, from a persistent groper. As Mari becomes enamored with the charming Yu, complications arise as their next assignment jeopardizes Yu's standing, putting Mari in a difficult position.