Akuma to Hako no Kanrinin

Dia, a lonely demon who has been trapped in a dungeon for 200 years.
Ann, who is serious and straight-laced, is appointed as the jailer.
"I want to be special to someone," said the free-spirited Dia, who gradually moved Anne's heart.
At that time, Anne finds out that Dia's execution plan is in progress--?
A miniature garden story in which a less than "special" guard and a demon connect hearts.

Note: Previously a oneshot in Hana to Yume issue 17 on August 5, 2022. Due to popularity, the full serialization started in Hana to Yume issue 24 on November 18, 2022.