His friends like Kakashi would be cautious yet supportive. Kakashi would likely give Naruto advice on how to handle the relationship and the responsibilities that come with it. In Kirigakure, Mei's comrades might initially be distrustful of Naruto, but as they see his good intentions and how he treats Mei, they would gradually accept him. And Naruto's friends from other villages he has befriended over the years would see it as a positive step towards a more unified ninja world.
Sure. 'My Happy Marriage' was adapted from a manga. The adaptation tries to stay true to the original source material while bringing the story to life on the screen.
It's a novel. The structure and style of My Happy Marriage indicate that it originated as a novel, not a manga. The depth of character development and the complexity of the plot are typical of a novel format.