Fuuto Tantei is a detective based on Kamen Rider W , in fact its the sequel to the Tokusatsu show of the W so yes you do need to watch Kamen Rider W if you want to watch this anime , is it ? well yes , the monster designs are great , the hero himself Kamen Rider Double looks good in 2D animation , this show is short and sweet , its the gold start for any newcomer to Kamen Rider anything , would you need past information ? yes just the old show Live Action show , Noting more ,I wish the show was longer than 12 eps , the show itself does somewhat feel like KRW to me