In 1970, manga artist Masako Yashiro published the "shōjo" manga , which focuses on a love triangle between two girls and a boy. Noted as the first non-Class S manga to depict an intimate relationship between women, "Shīkuretto Rabu" is regarded by some scholars as the first work in the "yuri" genre. As both Yashiro and "Shīkuretto Rabu" are relatively obscure and the work focuses in part on male-female romance, most critics identify "Shiroi Heya no Futari" by Ryōko Yamagishi, published in 1971, as the first "yuri" manga. The 1970s also saw "shōjo" manga that dealt with transgender characters and characters who blur gender distinctions through cross-dressing, which was inspired in part by the Takarazuka Revue, an all-female theater troupe where women play male roles. These traits are most prominent in Riyoko Ikeda's works, including "The Rose of Versailles" (1972–1973), "Dear Brother" (1975), and "Claudine" (1978). Some "shōnen" works of this period featured lesbian characters, though they were typically depicted as fanservice and comic relief.