When Rinka Shinonome, a new transfer student, arrives in high schooler Mitsunari Miyazawa's class, he immediately falls for her and asks her out... only to be impaled by a grotesque monster! The next day, he awakens to find it was all a dream... or was it? As it turns out, he's been reborn with the power of the Magus of Envy, and he'll be fighting alongside Rinka from now on! Will he be able to master his new abilities and protect his little sister from the fiends that once claimed his life?