Ever since moving into his own apartment, quiet high school student Kei has been looking for a new thrill. He soon finds himself playing mahjong, but his whole life takes a dramatic turn when he is forced to play the game with a criminal group. Even though the odds seem against him, Kei is able to outmatch the others. Instead of claiming his reward in cash, however, he decides to take an abducted girl named Amina under his wing. Due to Kei's skills and cold playstyle, the mysterious Hideharu Seki takes an interest in him, introducing him to mahjong parlors and new potential opponents. But when matched up against an experienced player named Doujima, Kei is severely outskilled and only narrowly escapes going into serious debt. If he wants to protect his new life with Amina, Kei must find a way to outwit these shady characters and come out on top in every game he plays.

In recent years, creatures known as Kaii have frequently attacked cities and wrought destruction. Exterminating these monsters quickly became a popular and well-respected profession, carried out by magical girls. More than five hundred magical girl companies, ranging from small ventures to large corporations, offer their aid to those who need it. Kana Sakuragi is a studious college graduate struggling to land a job despite attending numerous interviews. But when a Kaii attacks during her latest interview, she finds herself assisting the magical girl responding to the crisis. Although she lacks battle experience, Kana relies on her exceptional memory and knowledge to help subdue the monster. Hitomi Koshigaya, the headstrong magical girl who faced the Kaii, recognizes Kana's potential and invites her to join Magilumiere Magical Girls Inc.—the startup where Hitomi works. Wishing to make a difference, Kana accepts the offer to become a magical girl herself. While Kana may not be suited for the corporate world, it soon becomes clear that her true calling is to rise as one of the most talented magical girls in existence.

As dungeon-like treasure vaults started appearing throughout the land, more and more people began signing up as treasure hunters—risking their lives to obtain the vast riches and ancient relics inside. In the imperial capital of Zebrudia, the top hunter party is the Grieving Souls—a group of six childhood friends led by Krai Andrey, who is thought to be the strongest of them due to having a reputed wide array of skills. However, Krai actually has no special talent. His accomplishments are actually the result of his friends being overpowered. Krai has repeatedly attempted to leave the party out of fear his lack of aptitudes would one day cause his companions' downfall. Nevertheless, everyone around Krai thinks differently, making him feel obligated to remain the group's leader.

College student Tokiwa gets invited to a mixer by his female classmate Suo. But when he arrives with his friends, they're greeted by three dazzlingly handsome men?!