26-year-old Chiaki Nagai is living her childhood dream of working on a construction site. A modern girl with a stylish bob and a love of nail art, she lives in an on-site dorm and leads a team of 40 men working on a major tunnel project. And away from the digging, there are always piles of paperwork waiting for her back in the office cabin. Since becoming forewoman in late 2015, Nagai has worked hard to gain acceptance among her male colleagues, but has faced a unique set of hurdles. She has to direct industry veterans who are old enough to be her father, and in the hazardous construction environment, when her orders put staff in danger, Nagai faces some harsh criticism of her own. We follow Chiaki Nagai, balancing joy and anxiety as she works towards her eventual goal of running an entire site.