I've Started Doujin Activities!?

Haruto Sakurai went to a special school to become a mangaka. Now graduated, he goes to a publisher to show his first manuscript to finally enter the profession. However, when he meets his publisher, the latter advises him to start with doujinshi. Displeased but having no other choice, he decides to start. But he doesn't count on his twin sister, Miharu, a true fujoshi, who will quickly introduce him to the life of a doujinshika!