Tadashi Ore wa Heroine Toshite is a Manga/Manhwa/Manhua in english language, Gender Bender series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

After the manufacturing company of R-18 dating sims undergoes dissolution, an obsessed 30-year-old virgin visits a deserted shrine and requests to be sent to the world of their masterpiece, Kokorone Heartful. Although his wish is granted, the god mistakenly turns him into the heroine instead of the protagonist. Ordinarily the romancing choices are left to the protagonist. However, unless he completes the game as the heroine, he will be forced to remain in Kokorone Heartful as a woman forever. Will he be able to complete the game in this state?