A media franchise created by Futaba Hina and Sasaki Mutsumi, consisting of light novels, visual novels, a 2004 manga serialized in Dengeki G's Magazine, illustrated by Kinkakuji Pururu, and a 2004 anime by Telecom Animation Film.
Further adaptations include Futakoi Alternative (フタコイ オルタナティブ), consisting of a light novel, visual novel for the PlayStation 2, manga illustrated by Araki Kanao, and a 2005 anime by ufotable. And lastly, Futakoijima (双恋島), for the PS2.
