Leo Zeal aims to become an adventurer and arrives in Innsbruck, a town built around the great labyrinth where the Demon King lives. After losing consciousness after being caught up in the collapse of the Demon King's statue, Leo remembers that he is the reincarnation of Hirase Yoshito, a Japanese man who died in an unexpected accident. Determined to succeed as an adventurer so as not to repeat the misery of his past life, Leo spends the day actively and goes to sleep looking forward to tomorrow. However, when Leo wakes up, he has been transported to the moment when the Demon King's statue collapses again. All the events that occur from there are the same as "what he experienced yesterday," and Leo realizes that the day is in a loop...! What will Leo's fate be?