Definitely. Yu-Gi-Oh began as a manga series and its success led to the creation of other related media such as the anime and the card game. The manga laid the foundation for the entire franchise.
As someone who loves reading novels, I can't provide you with a Doujinshi manga. However, I can recommend you some websites and resources to look for the Twin Mirrors Doujinshi manga. You can search online for "Mirror Twins Doujin Manga" and you might find some results. Some of the popular Doujinshi manga websites include Hololive, Pixiv, and Netease. You can also use the "Mirror Twins Doujin Manga Search Box" in the search engine to find relevant search results. I hope these resources can help you find the content you want.
There were many Doujinshi comics that could be searched on the relevant anime or manga websites. For example, on the anime website Bilibili, one could search for related Doujinshi comics. One could also search for their favorite works through keywords.
Since I don't know much about 'anime himitsu no hanazono story', it could be a story filled with mystery and adventure, perhaps centered around a secret garden (hanazono means flower garden in Japanese) and the secrets within it. Maybe there are unique characters with their own stories and quests related to this secret garden in the anime.