I'm not entirely sure as I haven't read it specifically. But generally, an 'isekai' often involves a character being transported to another world. An 'izakaya' is a Japanese pub - so perhaps it's about a character who gets transported to a world where an izakaya called Nobu plays a significant role.
I'm not sure if it's a popular genre on its own. Isekai is a popular genre in general, but the combination with an izakaya and specifically 'Nobu' might be quite niche. It really depends on how well the concept has been executed and marketed.
I don't have specific knowledge about the plot of 'izakaya nobu light novel'. However, generally, if it's related to an izakaya (a type of Japanese pub), the plot might revolve around the characters who work or frequent the izakaya. It could involve their daily lives, relationships, and the stories that unfold within the izakaya setting. Maybe there are some unique food descriptions and cultural elements related to izakayas as well.
Definitely. The story of Hachi originated from a true event. It showcases the remarkable devotion and unwavering love a dog can have for its human companion.