The main character, Hikaribashi Yukio, works passionately in PR for a menstrual period product manufacturer and, as a single father, is raising a daughter in high school and a son in middle school. He has become popular on social media as ‘The Period Guy’, which his adolescent daughter Hana has mixed feelings about. One day, on a live TV show, Yukio gets worked up by a co-star’s provocations and blurts out, ‘I know my daughter’s period cycle perfectly’! His company is flooded with complaints. Due to gossip at school, Hana runs away. Can Yukio ride out the uproar and make up with his beloved daughter? How will father and daughter overcome their misunderstandings concerning periods? For everything that occurs in the world, there are always two categories of people: those who experience it, and those who do not. But if someone says, ‘You don’t experience this yourself, so you can never understand how I feel’, communication comes to a halt. Where do we go from here? Through the current topic of menstrual periods in Japan, which are rarely discussed openly and often treated as taboo, this work depicts people with different experiences learning to understand each other better.