Haru, a determined 15-year-old, embarks on a journey to master Shinkai, a formidable source of energy crucial for protecting Kagehana Village. Alongside his friends, he faces challenging missions that test their skills and bonds. As Haru delves deeper into his training, he becomes increasingly motivated to uncover the truth behind his lost parents, hoping that this quest will not only strengthen his powers but also lead him to a deeper understanding of himself and his place in the world.