A well-known manga on this topic is 'Blue Giant'. It focuses on a character's passion for making manga and the challenges along the way. The story is engaging and gives a realistic portrayal of the manga industry.
The main characteristics of making love manga include exploring deep emotions of love and passion. The storylines might involve complex relationships and personal growth. Also, the visuals can be quite sensual and alluring to convey the romantic atmosphere.
The initial step in creating a manga is to determine the genre and theme. Decide if it's going to be action, romance, fantasy, or something else. Then, start fleshing out the basic story framework within that genre.
First, you need to have a clear story idea. Think about what kind of characters and plot you want to create. Then, start sketching out your characters and rough storyboard.
I haven't heard any news about Hajime Isayama creating another manga. Usually, such announcements would come through official channels or reliable sources, and there haven't been any of those yet.