I usually read about boy become girl or gender swap between couple. Is there novel that girl transmigration into a boy (not change his body structure or crossdressing, but transmigration)? Like manhwa Circle Zero’s Otherworldly Hero Business: Reboot. his is boy become girl. But I mean this type of transmigration, but the reverse of itヽ(*゚ー゚*)ノ No CP is good, BL is good too
You can try Dominion's end it's an apocalypse story. https://www.novelupdates.com/series/dominions-end/