あらすじ
Ian Ferkus, a 3rd-year at the academy, one day receives a love letter from 7 years in the future. It refers to Ian as a hero, along with the warning that "the world will end if the future is not protected." Now Ian must discover what this future is and how to protect it with the help of his friends.
あらすじはAniListより（英語）。
データベース内の関連マンガ
自社カタログから選出 — 同じ作者、またはジャンルの重なり。