My First Friend Was a ZombieNewHajimete no Otomodachi wa Zombie Deshita; はじめてのお友達はゾンビでした; My First Friend was a Zombie

"The world of zombies might be pretty great!" Eko-chan, a victim of bullying, enjoys the devastated world with her first friend, who has become a zombie. They set off on a survival adventure, all while her friend slowly loses her humanity...