Fuji Television has announced a drama series featuring a lesbian love story as its central theme — a first for Japan.

But a prominent lesbian, gay, bisexual and transgender (LGBT) activist has slammed the show's promotional material for portraying an "out-of-date" image of same-sex couples.

"Transit Girls," which is set to debut on Nov. 7, tells the story of two girls, aged 18 and 21, who become stepsisters when their parents remarry. The girls, played by actresses Sairi Ito and Yui Sakuma, clash at first but then fall in love.