Until the exact doujin is identified, we can only speculate. But that uncertainty is exactly what makes doujin culture so vibrant: infinite creativity, infinite misremembering, and infinite possibilities hidden behind broken search strings.
Alternatively, this could be a corrupted version of a title like: "It's a doujin. When I went to the TV world, it was a deserted island. Is that top?" doujindesutvisekainiittaramujintoudeka top
Or: "It’s a doujin. When I went to the TV world, it was a deserted island. Is this top?" Until the exact doujin is identified, we can only speculate