The Great Demon System - Chapter 3: Such Nice People

After discovering about her wealthy husband’s affair, she humiliates the adulterous pair on the streets and divorces him the very next morning. Just as everyone anticipates her downfall, she goes on to marry the most brilliant bachelor in the nation whom her unfaithful former husband cannot hold a candle to!

“Aren’t your mother’s legs always hurting? It hasn’t gotten any better despite seeking help from various doctors.”
“How did you know that?”
“Not only do I know why her legs hurt, I can also treat her condition.”
“As long as you can treat my mother, I’ll give you anything you want.”
“I want money.”

After An Xiaoning uses her psychic powers to break the curse of a poltergeist, she earns herself a fortune as well as a perfect man of her dreams.

Don’t be daunted by her psychic powers, for this book isn’t terrifying at all!

- Description from Novelupdates

Anna Watson’s life was far from easy. A battle with cancer left her frail, defeated, and questioning her life’s meaning. Her final moments were filled with regret for dreams unrealized and paths untaken. But when death embraced her, it wasn’t the end—she awakened in an entirely new world: the wizarding world of Harry Potter. Yet, this wasn’t the familiar era of Harry, Ron, and Hermione. She found herself in the time of the Marauders, a generation before the golden trio.Even more shocking, Anna had a new identity: Petunia Evans, the famously non-magical, bitter sister of Lily Potter. But this Petunia is different. Born as Lily's twin, Anna retains her memories of her past life and discovers she has magic—a shocking divergence from the character she once read about. Her magical abilities open up opportunities and challenges, not only for her but for her relationship with Lily, her new family, and the unfolding story of the wizarding world.As Anna navigates Hogwarts alongside the Marauders, Severus Snape, and her own twin, she realizes that the story she once knew is shifting. Her choices ripple across timelines, altering destinies and alliances. Struggling to reconcile her knowledge of the future with her growing affection for this new life, Anna must decide: should she preserve the world’s fate or carve out a new destiny for herself and those she loves?In this thrilling twist on the Harry Potter universe, the story explores themes of second chances, sibling bonds, and the weight of choice, painting a vivid and detailed picture of what might have been if Petunia Evans had the magic to change it all.

The protagonist is a guy who is among the stupidest of the stupidest in the school. In this school, your grades can, under the supervision of teachers, take a virtual form to do combat! However, if you leave an examination half way, you get zero marks. A bright and cute girl, Mizuki Himeji, was having a high fever during the examination. Despite her potential to be the second highest scorer in the level, she obtained zero marks for having left due to her illness and is thus allocated to the worst class, class F.

Grades mean almost everything. For Class A, they have a smart-looking teacher, a plasma TV as big as the entire wall as their blackboard, personal laptops, personal air-cons, refrigerators, adjustable seats and all kinds of different appliances. Within the refrigerator, there are all kinds of drinks and snacks. Their ceiling is made of glass, the wall lets them put up high-class drawings and plants.

As for Class F, the worst class… They have Japanese desks and seat paddings. Their blackboard is dirty and there is no chalk even! Someone complains that the legs of his desk are broken, so the teacher asks, “Didn’t we distribute some glue to stick wood together? Glue it back yourself later.” Another one complains that wind is blowing in from the broken window. The teacher says, “I got it. I will apply for plastic bags and invisible glue to fix it later.” There are spider webs everywhere, not a patch of the wall is clean. A unique moldy smell spreads across the entire room; it must be from the old tatamis used to tile the floor. This is the status of class F.

The protagonist feels displeased at such an arrangement, and seeks help from his friends to try to make a change through summoning war!! And they devise all kinds of plans to try to beat the famous class A, intending to get class A’s classroom and equipment if they win!!