Zombie-Loan Concepts

Used frequently in Anime to either recap past events or provide a back story for a character, either their origin story or their off-screen training of new attack. Sometime and entire episode/chapter would be a entire flashback.

Shinigami are death gods, a recurring concept in multiple anime, notably in Bleach and Death Note

Zombies are an undead rotting corpse that is alive yet dead and have voracious appetites for living flesh.