Chikan densha: Yurete mitchaku o-shiri ai(2005)

Hiro and Fumio are day laborers whose hobby is groping. Today, they had just preyed on an office lady on a crowded train. On the way home, Hiro is approached by Hikozo, a former groper, who is single and lonely, and asks if he would like to become the son of his pseudo-family, showing him a stack of bills. Soon, a pseudo-family is formed, and Hiro, as Hikozo's son, welcomes his wife, Chiharu, keeping the fact that they are in a pseudo-family a secret. Before long, Hiro is enjoying life with this family. However, one of Chiharu's friends is a woman he once groped...