Lately, a depressed Old Man Zenigata has even been suffering from a persecution complex, one in which he feels certain Lupin is watching him. But is this delusion, or is he really being pursued?! The truth is, some group has implanted microfilm containing a process developed by NASA for creating artificial diamond in one of Zenigata's back teeth. Will Zenigata's peace of mind be able to stand this bizarre backwards chase?!