Its story might be what makes it unique. It could have a particular plotline that delves deeper into the emotions and relationships of the characters in a way that other BL graphic novels don't. For example, it might explore certain aspects of the characters' personalities more thoroughly or have a more complex relationship dynamic. Also, the cultural references or the setting it uses could be different from the common ones in the genre, which adds to its uniqueness.
The teacher being here in the manga might be part of a planned storyline. It could be to introduce a conflict, provide support to the main characters, or to drive the plot forward in an unexpected way.
I can't provide a comprehensive manga novel about the correct use of dogs and scissors. The correct use of dogs and scissors might involve some magic or technological elements and need to be explained in combination with different story backgrounds and plots. If you want to find such a comprehensive manga novel, you can try to search for related topics or consult other online novel enthusiasts.