A World for us Alone

After a catastrophic extinction event, human society has fallen - but somehow, Shintaro Kisaragi and his computer have survived. He only dares to venture outside when both his computer dies and his food supply runs low, leading him to an (annoyingly flirtatious) boy named Kuroha. The unlikely duo realize they both want to find their families - but can they overcome bandits, cannibals, mysterious shadow people and their own vast differences to find their younger siblings, Momo and Konoha, before it's too late?