My Butler Is a Mafioso Manga

Princess Marina must find a way to save Scylla, her frozen kingdom, from ruin. Facing a marriage she does not want, she encounters a group of mafia members who have suddenly arrived from another world, carrying strange weapons and keeping their motives unclear. Among them is Heart, a ruthless man who becomes Marina’s unlikely butler and closest ally. As she comes to depend on him to protect Scylla, Marina finds it increasingly difficult to ignore the feelings growing between them.