Bulma Adventure 4 V10 Yamamotodoujinshi Verified -

The user mentioned "Yamamoto" as part of the title. That could be a creator's name or a character reference. However, I'm not familiar with a specific doujinshi titled exactly like that. I should check if Yamamoto is a known doujinshi artist in the Dragon Ball community. Quick search shows that Yamamoto might not be a widely recognized name in this context. Possible that it's a pseudonym or a lesser-known artist.