My Dark-Side Girlfriend

In 2420, some humans had established themselves on the planet Orion and entered the middle stage of civilization. At a prestigious junior high school in Akiwara Province, packed with aristocratic elites, a handsome, lucky boy was struck by a mysterious System... A scheming, lovesick heiress; a beautiful, super-strong, tomboyish desk mate; a sweet and adorable mixed-race girl... and a whole crowd of rivals sharpening their knives and charging at him suddenly burst into his life. (A fun, action-packed slice-of-life story. Leveling up and fighting monsters isn't the point. The logic is a bit flimsy, and I'm letting loose, so just enjoy yourselves.)