Numerous magical Artifacts were stolen and dispersed across the globe long ago. In the wrong hands, these objects brought misfortune to those who abused their power. The Hoshisato family of magicians possesses special access to these items and feels responsible for returning them to their proper places.
Despite her lack of experience, Kana "Hatena" Hoshisato wants to assist her parents, Mamoru and Maeve, in their mission, striving to improve her skills. Her childhood friend, Makoto Shiranui, arrives at the mansion to study magic under her father’s guidance, honoring a promise made years prior. Hatena is thrilled to reunite with him but is crushed to discover that Makoto, whom she believed to be a girl, is actually a boy, resulting in a tense reunion.
Makoto soon learns about the Artifacts and the true nature of the magicians he respects. Undeterred, he remains dedicated to keeping his promises and mastering magic for two reasons: to alleviate the sorrow of those around him and, most importantly, to become a worthy partner for Hatena.