Even though Koki Nakagawa and his childhood friend Ayumi Fujisaki bicker like cats and dogs, one thing's for sure...he's head-over-heels in love with her. But when he finally starts to confess his feelings, his awkward-but-nice-enough classmate, Jindo-san, announces that she's Koki's girlfriend! She tells Koki that he can never tell Ayumi his true feelings...because if he does, the world will end in apocalyptic disaster? What's a guy to do?
Koki now rushes to rescue an abducted Ayumi. However, as he arrives, an impossible-to-accept truth is revealed by Ayumi! “The truth is, Ko, I love you... But, I...” And thus, Ayumi reveals the true backstory to the accident from eight years ago together with her feelings that she’s harbored until this very day. While Koki finds himself stupefied by this revelation, Tenshi appears to steal Ayumi’s powers once and for all! Welcome to the genuine, final installation of this supremely extravagant, ultimate choice romcom!