I Just Came Back from the Apocalypse and They Said I Had Chuunibyou

The most powerful commander of the doomsday was reborn 20 years ago and was treated as a boy with chuunibyou due to memory fusion. However, he discovered that the truth of the doomsday was far darker than imagined—— Light novel style, background, Kojima Sakura. Scene: Flashback in the command room of the Doomsday Fortress In the piercing sirens Researcher A roared: "Commander! The final barrier will not last ten minutes!" The protagonist wiped his saber calmly: "Is the national transfer completed?" Researcher B choked with sobs: "... Thirty-two thousand people, all entered the ritual circle. They said they want you... To see the dawn." The protagonist paused: "Nonsense. I am a soldier, and those who deserve to be on the front line are——" The old professor spoke over the radio with an old voice: "Child, listen carefully. You are our only key to analyzing the 'source of the disaster'. Stay alive and go back to the past... To find the 'initial infected person No. 0'." Protagonist: "Number Zero? That's not a legend——" explosion The old professor continued: "It's not a monster... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.