The Hero party wants MC to guide them to the dungeon where the Demon King is hiding. Eventually, they defeat the demon king, and the village has a banquet while MC goes to the capital to find Ageha. Suddenly, the capital gets destroyed by swarms of dragons, and MC meets the Demon King, who kills him. In the next loop, MC decides to burn the Demon King's body, and the Hero decapitates the head for proof of defeating the Demon King. Worried about the head resurrecting, MC decides to accompany the hero to the capital.
The next day, while they are on their way to the capital, the Knight suddenly kills the Hero and resurrects the Demon King, and MC dies. In the next loop, he tries to prevent the resurrection of the Demon King by burning, crushing the bones, and scattering them on some pond. There, he is discovered by the Knight, who belongs to an organization that aims to kill the Hero and resurrect the Demon King using a ring, resulting in the MC's death. In the following loop, he tries everything to kill the knight, and when he almost goes for the final blow, the warrior from the same organization shows up with a scythe parasite with three heads and kills MC.
Next loop, the Parasite Scythe actually senses something from MC, and the Warrior is cautious because the scythe can sense the timeline has changed and seals MC to prevent him from dying, which activates the save & reset skill. MC is isolated in the darkness, for god knows how long he is bored to death, until Judith unseals MC and kills him. In the next loop, he talks to the hero and warns him about the traitor. At night, MC and Knight guard the Hero. The next day, the warrior comes in and attacks MC while the hero fights Knight. The Knight says some traumatic words, and the Hero dies, and MC dies too. In the next loop, MC talks to the Elf Mage and warns her about the traitor. The next day, everything went the same, but MC is saved by the Elf mage.
After that, they both went to the capital to see the destroyed capital and decided to go to the neighboring country. MC and Elf have a romantic development. After reaching the neighboring country, they fight the dragon and demon army. MC and Elf Mage have some intimate moments and decide to marry her. The next day the Demon King descends and fights the Elf Mage, but she launches MC far away because she wants him to live. MC decides to go back but is intercepted by the Knight and Warrior. MC swallows the knight's sword and becomes its master because MC knew she wanted to become human and unleash her predator, eventually devouring the enemy. MC saves Elf Mage from the Demon King and escapes, but Elf Mage is badly injured and eventually succumbs to her injuries because of the Demon King. Moments before Elf dies, she vows to fall in love with MC. In the next loop, MC meets Black Ageha, who smells an unfamiliar woman from MC and then kills. Ageha kills MC because she wants to die eternally, but MC always chooses to respawn every time, and then MC is killed many times until Ageha gets tired. MC decides to kiss Ageha to stabilize her and make her comply to save the world. The Ageha MC kisses is actually a clone, and the true body is sealed in the holy sword held by the hero. To unseal herself, she commands the swordsman to persuade the hero to take the sword. Ageha then appears and knocks the hero unconscious, and together they defeat the knight and warrior.
To save the world, Ageha wants to kill the Hero Party, but MC didn’t want the Elf Mage to die, so he tries to talk to her and explain the situation. The Elf mage witnessed Ageha killing the swordsman because she wanted to prevent the discrimination of the silver-haired people who sided with the Demon King. They return to the surface and head to the capital to celebrate the defeat of the Demon King. While on the carriage, Ageha proclaims that MC and her are lovers, and suddenly the Elf Mage cries. At the capital, MC and Ageha had some intimate moments. After that, MC suddenly died. MC asks Ageha, and she says she doesn’t remember anything. This time the Elf Mage confessed her love and kissed MC. Because MC is worried about dying in his sleep, Ageha and MC stay up all night to guard his life. In the middle of the night, someone is approaching their room, and Ageha goes outside to fight the intruder. It goes quiet after a while, and MC goes outside where he sees Ageha's dead body, and MC was killed too. In the next loop, MC meets Black Ageha, who doesn’t remember the previous loop. This time, MC decides to escape far away to outrun the assassin.
One night Ageha went outside alone. MC got curious and went outside, where he saw two Agehas killing each other. MC finds out that Ageha was lying about not remembering the past loop, and they have been competing to have MC love by killing each other, and the one who wins gets to be with MC in the next loop. Ageha explains that tonight the world will end because of some godlike being, so instead of the world ending, she decides to live eternally with MC in this infinite loop. Ageha decided to kill MC, and then an error occurred because of the grandfather paradox when she killed the swordsman, who might be MC's ancestor. Because of the error, she decides to reset everything. MC decides to get sealed with Ageha for 100 years in exchange for the world not getting destroyed by the god-like being. However, when MC is about to get sealed, he is transported back to the present timeline. Before disappearing, he made a vow with Ageha to unseal her. In the nothingness, Ageha and the clone Black Ageha spent 100 years where she got bored and gave adventurer save & reset skills for entertainment, but only MC is the one who can unseal her.
Meanwhile, MC is talking with the Observer, who thanks MC for saving the world. MC hurries back to the dungeon to unseal Ageha. They both go back to the surface and revive the dead childhood friend with the resurrection ring taken from the knight. The childhood friend wants revenge on the people who killed her, and the three go to MC's house. A festival is about to be held in the village to celebrate 100 years after killing the Demon King, but the childhood friend wants to take revenge at the same time. MC sends Ageha with a map of the childhood friend's house to check on her parents, but suddenly something strange is happening. Ageha goes crazy and apologizes for not being able to save MC and writes down information about the future. After Ageha disappeared from MC's memory, the information tells MC that the childhood friend is an impostor undead who wants to kill every human. MC panics, and the impostor attacks MC and flees. The next information says MC must guard the priest, who will create a barrier. Then MC becomes the priest's guard, who hides her silver hair with hair dyes to avoid discrimination and feels MC is trustworthy because MC is the same. The next day, the ritual to create the barrier at the church is performed. Some suspicious people try to attack the priest, but MC is able to guard her.
The assailant stole some ritual artifact that supports the barrier, so MC and Priest chase after it. The assailant is actually the undead childhood friend; MC fights it but gets hurt. Priest carries MC to some hut where they talk naked because their clothes are wet from the rain, and they huddle together with a blanket. Priest confesses her love to MC, and MC did the deed with her. The next day news reaches them that the royal noble and his guards got wiped out, including the Elf Mage, who is MC's past timeline lover. MC goes to the place where she is and finds the corpses laid out neatly. MC asks a monster where the Elf Mage is, and it guides MC to her. The monster then kills MC. In the next loop, MC decides to go to the capital before the Elf Mage dies from the monster. MC meets the Elf Mage and explains about the travel to the past. (WN chapter 152)
