I'm not entirely sure as I haven't read it specifically. But generally, an isekai light novel often involves a character being transported to another world. 'jk haru' might be the name of the main character. So it could be about Haru's adventures in a different world.
As the title implies, Haru is probably a central figure. There might also be other characters in the new world that Haru meets. For example, there could be a wizard or a knight who helps or hinders Haru's journey. However, without reading the novel, it's difficult to say for certain who all the main characters are.
I'm not entirely sure as I haven't read it specifically. But generally, an 'isekai novel' often involves a character being transported to another world. Maybe 'jk haru' is the main character in this story who experiences adventures in a different realm.
Sadly, I don't have information regarding the author of this 'jk haru wa isekai novel'. It could be a relatively unknown work or from an indie author. You might want to search for it on specialized Japanese literature websites or forums where fans of isekai novels might be able to help you out.
The popularity of 'isekai wa smartphone to tomo ni light novel' can be quite variable. Some light novels gain popularity through word - of - mouth, others through strong marketing. If this particular one has unique characters, an engaging plot that makes good use of the smartphone in the isekai setting, and has been translated into multiple languages, it may have a wider readership. But if it fails to stand out among the many isekai - themed light novels, it might not be as popular. Additionally, the popularity might also be influenced by how well it has been adapted, if at all, into other media such as anime or manga.
Based on the title, one of the main characters is likely the 'yankee'. And the other important character would be the'seirei' (the spirit) who loves the Yankee in the isekai world. But there could be other supporting characters that we don't know about without reading the novel.
The title 'yankee wa isekai de seirei ni aisaremasu novel' gives some clues. 'Yankee' might be a unique type of protagonist. The 'isekai' part indicates a different world setting. And 'seirei ni aisaremasu' means being loved by a spirit. It could be a story about a Yankee's adventures in a new world where a spirit has special feelings for them. There could be elements of discovery, relationship - building between the Yankee and the spirit, and maybe challenges they face together in this strange new isekai world.
I'm not entirely sure as I haven't read it specifically. But generally, in this kind of 'isekai' (another world) themed web novel, it might be about a 'yankee' (which could refer to a certain type of character, perhaps a tough or delinquent - like one) who gets transported to another world and is loved by spirits there.
There's no easy way to tell if'read isekai wa smartphone to tomo ni light novel' is popular just from this title. Some light novels in the isekai genre with unique concepts like this can gain a large following, but it also depends on how well it's written, how engaging the characters are, and if it gets good reviews. If it has been well - promoted and has elements that appeal to a wide range of readers, it could be popular, but without more information, it's hard to say.
Well, 'isekai wa smartphone to tomo ni' as a light novel could be about a protagonist's adventure in a different world. The smartphone part is interesting. Maybe it gives the main character some unique abilities or ways to interact with this new world. It could be that the story focuses on how the character uses modern - day technology in a fantasy setting, like using the smartphone for communication, information gathering, or even as a weapon or tool in this isekai world.