Adopted into Itsuka’s family household at very young age and been living a fairly average normal life until recently. At the start of the novel (Volume 1) and his new high school year as a 2nd year student, he accidentally stumbles into a world unknown to him or to the public for that matter of facts. Discovering the real reason behind the spacequakes and the fight between the AST and the spirits; forcefully or voluntarily, one or the other, into the organization known as Ratatoskr commanded by his little sister which was also a surprise to him. With the only explanation from her was that only he can save the spirits, with only that he reluctantly joins due to his nature to help and/or save people in need. Going about with his normal life and saving spirits is one thing, but with each new encounter with new spirits to save there always some type of new hardship on Shido's mental health since he have to deal with the opposite gender which he is not used to.
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