Isekai Tensei, Ore ga Otome ge de Kyuuseishu is a Manga/Manhwa/Manhua in english language, DEMONS series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Because of his little sister, high school student Tarou (alias) is transferred to an otome game as the heroine. The more he tries to avoid the handsome love interests, the further he advances into their love routes! In the end, will he be able to return to his original world?! And will he be able to protect his chastity?!