The term appears to be a combination of several Japanese words:
While the exact "Rikorika" work may be lost or extremely niche, here are similar doujinshi and video titles that match the (welcome + boy + new): doujindesutvyoukosorikorikanootokonok new
It seems like you've provided a string of text that doesn't form a coherent question or topic in English. The text "doujindesutvyoukosorikorikanootokonok" appears to be a jumbled collection of characters and does not seem to relate to a recognizable topic or request for information. The term appears to be a combination of