Sekai ka Kanojo ka Erabenai

Kouki Nakagawa is deeply in love with his childhood friend Ayumi Fujisaki, despite their constant arguments. When he is about to confess his feelings to her, his classmate Jindou-san unexpectedly reveals herself as his girlfriend. She warns Kouki that confessing his true feelings to Ayumi will trigger a catastrophic global disaster. Now, he must navigate this confusing situation and decide what to do.