I Joined an Immortal Sect, My Junior Sister Picked a Monkey First and Tossed Me a Capybara

After my junior sister and I joined the Immortal Sect, our master gave us two contracted beasts. Following the principle of being a proper lady, my junior sister chose an adorable, even-tempered capybara. I could only choose a gibbon that hopped around all day and often smacked people upside the head. Who would have guessed that when war broke out in the Immortal Realm, the two of us, the sect's only beast-contractors, would be sent into battle? My junior sister's capybara was so even-tempered that it wouldn't cooperate with her moves at all. In the end, she was gravely wounded and faced certain death. My gibbon, on the other hand, seemed right at home. The two of us fought in perfect sync, going on a rampage. The sect won, and I was hailed as its new leader. Consumed by jealousy, my junior sister dragged me into a self-destructing blast as she died. When I opened my eyes again, we were back on the day we chose our contracted beasts. This time, my junior sister beat me to the gibbon. “Senior Sister, this life, just leave the sect leader's seat to me.” But she didn't know that, for all its merits, the gibbon was utterly insane.