After the Itsuka Disaster (also known as "Shidou's Spirit Disaster"), his spiritual power returned to normal temporarily with the help of other spirits. But one week after that event, there were signs of an extremely powerful surge in spiritual power. Thanks to the technology on the airship Fraxinus, everyone discovered that the source of this tremendous spiritual power, like a mobile bomb, was coming from someone very familiar to Shidou. And that person was none other than Kotori! Disclaimer: this story is by @Việt Izuku and not my (Have 3 chapter)
3 parts