Tomato's Four Post-Apocalyptic Novels!

Global water resources are dwindling; a single drop could save a life. I had just risked my life to bring back the "Rain-Calling Conch" from the secret realm when my stepsister accidentally shattered it, fusing it into her palm. My stepmother immediately declared to everyone that my stepsister was a reincarnated goddess, capable of summoning rain. Amidst the adoration, my stepsister, arm in arm with my fiancé, looked at me innocently: "Sister, although I destroyed your thing, I can now save all of humanity. A selfish person like you would never understand such great love." My fiancé even publicly announced his annulment of our engagement, vowing to protect the goddess for life. I chuckled, generously offering my blessings, and turned away.