Another thought: Could "Doujindesu" be part of "Doujin Desu" (Doujin for short)? Maybe the user is referring to an anime titled "Destiny of Friends Chitose Friends" and the exclusive doujin. But since it's a fan-made title, maybe the user made a mistake in the transliteration. Alternatively, "Destiny" combined with "Tomodachi" (friends), "Chitose" (name or time), and "Friendina" (friend plus something).