Tatoe Hai ni Natte mo

High school student Shinomiya Ryouma is desperately trying to raise a billion yen to pay for his beloved younger sister’s treatment. A mysterious woman asks whether he is willing to stake his life on what he wants, then gives him a ticket; soon afterward, an accident changes everything. When Ryouma wakes, he has become a girl and is trapped in a deadly game. Winning offers a chance to reverse his fate, but losing means instant death.