My Campus Beauty Girlfriend Is the Devil, so I Have No Choice but to Become the Evil God

Lu Yu and his school beauty girlfriend traveled to a different world. Human beings in this world are in a difficult situation. There are monsters raging inside, and all the races in the world are watching. Fortunately, humans can activate the skill mall, where they can quickly become stronger by purchasing learned skills. The model of the skill mall is similar to the previous version of Teamfight Tactics. And Lu Yu, who is bound to the destiny guidance system, can use whatever skills he wants! Just when everyone thought that the five-cost skill card was the most expensive and powerful, Lu Yu actually refreshed a ten-cost skill card! Soon after, Lu Yu was regarded as the last hope of mankind. At this time, people were horrified to discover that the demon king who made mankind feel extremely frightened was actually Lu Yu's girlfriend... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.