Likely interpretations (I will proceed with #1 unless you tell me otherwise):
This seems like a string of romaji (Japanese phonetic writing) that might be broken down into something like: doujindesutvhajimetenoseitsuuoshotasen
For first-timers, fan doujin attracts more readers because of existing fandom. What is Doujinshi TV Hajimete no Seikatsu Shotasen
It seems like you've provided a string of text that doesn't form coherent words or a message in any standard language I'm familiar with. The text "doujindesutvhajimetenoseitsuuoshotasen" appears to be a jumbled collection of characters and doesn't seem to convey a clear meaning. A discussion on the Japanese concept of "doujin"