Your sweet blood~ A tododeku halloween story

Midoriya and Bakugou are trick or treating together on Halloween eve. But Bakugou doesn't want to be with Midoriya and he leaves him. After a successful candy hunt, Midoriya finds a medieval-looking castle. From curiosity, he steps inside. But when he enters the castle, he immediately notices that something is off. He meets a person who is acting pretty strange. He is very pale and sleeps in a coffin. What is up with him. And what are these strange things going on in the castle?