I'm Mentally Ill, and You Want Me to Save the World with a Yandere Campus Beauty?

Chen Hao transmigrates to another world. After admitting he's a transmigrator, he's sent to a mental hospital, where a female patient constantly subjects him to merciless torment!! Strangely, every time she's done, she says to him, "Master, forgive your subordinate for her disrespect!" Then one day, demonic beasts awaken across the globe, the world's order collapses, and humanity becomes their prey. The lovesick girl kneels before Chen Hao and begs, "Master, please lead us and save the world!!" What? You guys? That's right, there are others like me, too!!