久瀬 蒼馬

"I'll be by your side no matter what happens."

A man who was invited to the castle.
Although he means well, he can be overbearing at times, which is why Seisuke calls him "My Lord."
When he heard about Zakuro's past, he proudly proclaimed "I will be your little brother!" to her.
He has a strange way of thinking but he's a nice person.