The members of SMAP, the five-man mega-group that disbanded in December 2016, had their share of hit films, though their central field of operation was always television. Now three of them — Goro Inagaki, Shingo Katori and Tsuyoshi Kusanagi — star in a four-part omnibus film with a limited release, a project unthinkable when Johnny & Associates, the talent agency that made SMAP the biggest boy band in Japanese pop music history, was managing their careers.