Call to the Void by Robert Royal Poff

 Charlotte, a trans teen struggling with her adopted family's acceptance of her identity, and Lu, a washout dropout, are hopeful to begin the next chapter of their lives when the world makes an abrupt shift into chaos. A flip is switched in everyone’s brains, releasing a constant and all powerful suicidal edge. Soon, their struggles of self acceptance are morphed into struggles for daily survival as the last of humanity succumbs to a grave fate.

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