Toomics typically offers some content for free as a teaser or to attract readers. However, regarding 'My Stepmom' graphic novel specifically, it's hard to say without looking into it. Some graphic novels have a few initial chapters free and then require payment for the rest. So, you should visit the Toomics website and search for 'My Stepmom' to find out if there is a free option.
I'm not sure about its popularity specifically. But if it is popular, it could be because stepmom - family relationship stories are quite common and relatable to many people who have been through family re - structuring.
It could be a story about a person who has an unseen friend, like a guardian angel. Maybe this secret friend helps the protagonist in various ways, such as protecting them from danger or giving them good advice at crucial moments.
I believe my secret friend, my guardian angel, has been with me through many things. For example, I was once in a hurry to catch a bus for an important exam. I dropped all my papers. My secret friend was there in an instant. They helped me pick up the papers and made sure I got on the bus on time. Their help was always timely and made me feel safe.
It could be a shy Hufflepuff student who has been observing Harry for a long time. This student might have some special powers or knowledge that they keep hidden. They become Harry's secret friend because they are afraid of being bullied or judged if their abilities are known.