The phrase is a combination of the Japanese phrase "Doujin Desu" (It is a doujin/fan-work) and a misheard or stylized lyric from the opening theme song "Kakumei Duality" (or a related meme edit), which sounds like "Do you wanna fight in this life?"
If you are looking to read it, searching for or "Do You Wanna Fight in This Life" on major manga platforms will yield the correct results. doujindesutvdoyouwannafightinthislife
Are you referring to a specific community, a video on a platform like YouTube or TikTok, or a lyric from a song? Is it a website? The phrase is a combination of the Japanese
(Verse 1) Staples in my sketchbook, midnight oil burns bright They said "get a real job, kill the dream tonight" But I've got a photocopier and a heart made of glue Doujin desu, motherfucker – I'm broadcasting to you (Verse 1) Staples in my sketchbook, midnight oil