Tokyo Apocalypse: It Starts with a Stunning Teacher in Black Stockings

[No NTR] [No betrayal by allies] [No angst and bitterness] [Multiple women, no exclusive pairing] + [Wreaking havoc on the Japanese] + [Supplies returned] + [Decisive and ruthless] + [Invincible] + [Self-interest] [No simping] + [No bleeding-heart saint] + [No cultivation in the later story] + [Apocalyptic farming] [Peaceful daily life after the apocalypse] Continuous torrential rain across the globe caused sea levels to rise, submerging the entire Blue Star. In his previous life, Niu Zhida had no System. After returning reborn, he was lucky enough to awaken an extraordinarily powerful System! Now that he had returned in a new body... he vowed to use his past-life survival experience to stay alive in the apocalypse, and live even better than before!