Rui wa Tomo o Yobu(るいは智を呼ぶ, lit. Rui Calls Tomo) is a Japanese adult visual novel developed by Akatsuki Works and first released for the PC as a DVD on June 26, 2008 as a limited edition; the regular edition followed on July 31, 2008. The game is described by the development team as a "new beautiful girl entertainment ADV"(新美少女エンタメADVshin bishōjo entame ADV). The gameplay in Rui wa Tomo o Yobu follows a plot line which offers pre-determined scenarios with courses of interaction, and focuses on the appeal of the five female main characters. The title Rui wa Tomo o Yobu is also a Japanese proverb equivalent to the English proverb "birds of a feather flock together" when written with the kanji and kana 類は友を呼ぶ .