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?
“I wish I never would have learned what love is...!” However, Ayumi notes the change in Jindo and makes a shockingly bold move toward Koki. It seems this pandemonium is playing them right into Tenshi’s hand, though? With the balance between her and the world shattered, does this all but confirm that all choices lead to carnage?!