Great Navigation: I, the Devil Twin, Started Flat

In the world of navigation, the weak crawl on the ground and beg for mercy, while only the strong can control their own destiny. My name is Allen, and I traveled through time and became an ordinary person in the world of navigation. Fortunately, I am bound to the two-dimensional sign-in system, and I can become stronger by signing in every day. I have a sister, her name is Nicole Robin, she is a person with abilities who ate the flower fruit. For some unknown reason, since the two of her siblings started wandering, she started practicing crazily, day and night. While my sister was practicing crazily, I chose to serve her tea and water, eat and drink every day, and sign in to become stronger. … My name is Nicole Robin. I am the supreme empress who ended the Age of Discovery. I traveled back a hundred years and vowed to change all regrets. However, she inexplicably gained a younger brother who was very lazy and ate and slept every day. However, he was very considerate when she was practicing, which somewhat calmed her angry heart. Looking at the bounty list with "Devil Twins" written in his hand, he faced a purgatory-level start. I had no choice but to work hard on my own. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.