Dear My Living Dead

Dear My Living Dead was a one-shot manga that was first mentioned in Volume 0 of Jibaku Shounen Hanako-kun but is not directly affiliated with its plot.

Plot Summary
It features a post-apocalyptic world, debuting two necromancers, Cult (Karuto) and Lily. The world is swarmed with the living dead (corpses that have been affected by an unknown curse). In order to combat this, the church employs people who wield powers to defeat these evil creatures. These people are signified by a distinct seal on their body that appears when they're around 5.

However, it has the ability to fade or disappear over time depending on the permanence, resulting in loss of powers. However, for those who have permanent seals, they have powers to utilize their strength and form contracts with lesser living dead such as deceased animals.

Characters
Cult

Lily