Narumi Katou is a middle-aged man who suffers from the bizarre ZONAPHA Syndrome: a rare and inexplicable disease that causes its victims to endure severe seizures at random, with the only cure being to watch someone laugh. One day, during Narumi's part time job, a young boy with a giant suitcase fleeing from three adults runs into him. The boy introduces himself as Masaru Saiga, the new owner of the famous Saiga Enterprises following his father's recent death. However, other members of his family are trying to assassinate him and claim the fortune for themselves.
as Masaru Saiga
as Narumi Katou
as Shirogane Saigazaki
as Lucille Berneuil
as Shōji Saiga
as Zenji Saiga
as Akira Ashika
as Christophe Guy Lesch
as Talanda Liselotte Tachibana
as Vilma Thorne
as Shinobu Nakamachi
as Noriyuki Nakamachi
as Hiroo Nakamachi
