I'm Mentally Ill, How Can I Save the World with the Sick School Beauty?

Chen Hao traveled to a different world. Because he confessed that he was a penetrator, he was sent to a mental hospital, but he was often mercilessly ravaged by a female patient there! ! The strange thing is that every time when she finished, the woman would say to her: Master, I'm sorry, my subordinate was rude! Until one day when the global monsters revived, the world order collapsed, and humans became blood eaters, the yandere girl knelt down and begged Chen Hao: Master, please lead us to save the world! ! What? You? Yes, there is more than one yandere like me! !