Ultimate Power: My Sister's System Is Not Serious

Ling Yue, the rising star of the iron space-time superpower family, is responsible for a mysterious system but is always tricked by its "unreliable" tasks. She is strong but is always disrupted by the system at critical moments. She and Xia Yu, who also hides their strength, have never known each other before, and they went from being mutually deceitful to fighting side by side. Facing the invasion of Demon Lord Diablo's demonic army, the two work together to travel through time and space such as gold and iron, and gather those with powers from all time and space. Although Ling Yue's system doesn't appear much, it always provides divine assistance in critical moments. Xia Yu's ghost phoenix power collides with Ling Yue's element control ability to create super combat power. Daily life is full of light-hearted and funny exchanges, and when fighting, the two powers join forces to fully unleash their aura. While fitting the world view of the ultimate series, they stage a passionate and funny battle for love and protection across time and space. Tags: Ultimate series fanfic, strong female, CP-oriented, double strong, lighthearted and funny, system, across time and space, superpower