After unintentionally running over a strange dog, Kazuto hears the announcement, 'You have acquired experience points. Kudo Kazuto has risen to Level 1,' ringing in his mind. The following day, he wakes up to a transformed reality where menacing creatures roam. Now faced with a world structured like a game with levels and abilities, Kazuto must navigate through constant peril. With a newfound special skill obtained the night before, Kazuto's journey for survival commences as he strives to level up and utilize his unique abilities.