How are you defining Sub Genre? Sub Genre is a division of a Genre, I.E, Contemporary Romance is a Sub Genre of Romance. I think we are both (I also am misusing Sub Genre's denotation), are talking of Romance as a secondary Genre. or maybe fused genre I.E., in English Terms, you are saying Naruto is an Adventure Romance.
The thing is it doesn't fit.
Naruto isn't about romantic love triumphing. It isn't about lovers accomplishing goals together.
You can have love interests in Adventure. You can have crushes, you can have love triangles. It's how these relationships are utilized that makes it into a romance, or sub-romance, or secondary Romance, however we are meaning the word to be, though it really is about Genre.
The Last is easy to fit into it: You have Love sacrificed for the Higher Cause, you have the couple placed in an exotic locale with a world in crisis, they have two goals, both the higher cause and love, and both must be achieved at the end. I.E., Hinata sacrifices her love for Naruto to save Hanabi, we have the journey to the moon to save the world in crisis, we have Naruto wanting to save the world and later be with Hinata, and vice versa for Hinata, and you have the achievement of both of these things.
You can't do that with Naruto the manga. SS definitely doesn't fit the model, nor does ST or NH or SI or definitely not CK. And no, no non-canon ship fits it either. The achievement of love never enters focus, not as a subplot or ever serious, and that is what bars Naruto from being classified with the additional genre, sub-genre, sub-genre, whatever we want to call it, of Romance.
You're complicating the sub-genre thing way too much. I explained it as much as I can with simplicity. It's a simple term.
Sub-genre is, as you said, a division of a genre. A romance sub-genre is like a sub-romance as you mentioned in part of your post. It can not be a genre. It can be secondary genre that the plot focuses on or doesn't focuses on. It's what shown and said related to romance.
For example, from what is related to romance is shown sometimes in the story as a whole, then we will have a sub-genre of romance.
Edited by T XD, 05 September 2017 - 05:26 PM.