The 'My Love Story with Yamada-kun' anime has indeed finished. It might leave you wanting more, but you can always relive the moments by revisiting the episodes or discussing it with fellow fans.
Overall, the Yamada-kun anime does justice to the manga. Some scenes might be presented differently for the sake of animation, but the core remains the same. There are also added details that enhance the viewing experience without straying far from the original.
You can start by checking well-known manga reading platforms like MangaFox or MangaReader. Also, some subscription-based services like Comixology or Kindle Unlimited might have it. Social media groups and fan communities related to the series could provide useful leads as well.
I'm not sure who the specific author of 'Strangers Yamada Novel' is as it's not a widely known title to me. It could be an indie or a relatively unknown work.
I'm not sure specifically as there could be many 'yamada love stories'. It might be about the love experiences of a person named Yamada, perhaps his or her journey in finding love, facing relationship challenges, and growing through love.