Mukai plays the role of Sakurai Ippo who works at a human resource rental company i.e. one which allows customers to rent people to pose as their friends, lovers or family members. He bears a deep hatred for his father (Nagatsuka Kyozo) who walked out on the family. One day, Ippo has to return to his hometown where his mother Taiko (Tanaka Yuko) is still staying at as his younger sister Honoka (Murakawa Eri) is getting married soon. However, he is shocked to see his father who had not been in touch with them for 20 years showing up unannounced at their family home.