会社員の後藤静華は、昼間の商店街に突如現れた通り魔に刺され、瀕死の重傷を負う。その瞬間、頭の中に鳴り響くのは…
《他者から倒されました。消滅カウントダウンを開始します》
「夜の案内者（ガイダンス）」の導きにより命を取り留め、常人には持ち得ない能力に目覚めた後藤。そして、世界はその瞬間から異界との繋がりを持ち、徐々に魔物が出現を始める…。
人知れず蠢く魔物への対抗を決意した後藤は、持ち前のポジティブさで、あくまで気楽に、大胆に。レベルアップや武器作り、そして来るべき終末サバイバル生活に心トキめかせながら戦いに身を投じていく！
White-collar worker Gotou Shizuka is attacked by a slasher who suddenly appears in the heart of the shopping district. Just as she is lose to her wounds, she hears a voice ring in her head.
“You have been defeated. Commencing termination countdown.”
Due to the counsel of the night guide (guidance) she narrowly escapes death and awakens with an ability that ordinary people do not possesses. In the same instance, this world became connected with another and monsters begin to spring forth…
Gotou makes a decision to fight against these monsters. With her positive nature and bold and carefree attitude, she throws herself into the heat of the battle while leveling up and making weapons.
