: The chains often seen in the series are revealed to be literal trauma flashbacks; Yuuhi was once physically chained and locked in a closet by his grandfather.
In Hoshi no Samidare (also known as Lucifer and the Biscuit Hammer ), , titled "Yuuhi Amamiya and the Beast Knights," covers a significant emotional turning point where Yuuhi finally confronts his past and his relationship with his grandfather. Key highlights from this part of the story include: Hoshi no Samidare 18
“The absolute justice boner I had when Yuuhi threw his chains into the air and yelled, "serves you right!" after his grandpa died. No one should be pressured to forgive abusers.” Reddit · r/anime : The chains often seen in the series