18 years old, 180cm The biological son of the Itoshi couple, owners of La Prigione Blu. He is 18 years old. He is being educated as the heir to the family. Characterized by red hair, thick eyebrows, long lower eyelashes, and turquoise eyes. He slicks back his choppy bangs to reveal his forehead, fixing them with hairspray instead of wax. He looks very similar to his brother Rin and has a cool, handsome image. A cynical and blunt sharp-tongued man. He is indifferent to others and hates being bothered; he says what needs to be said regardless of the time or place. He is willful and doesn't care about the opinions of others, but surprisingly, he has the flexibility to accept a proposal if it is rational. In his childhood, he showed a normal, immature side, such as playing with his brother Rin. However, his relationship with his biological brother Rin has currently collapsed for a certain reason, and he is not on good terms with anyone in the house. [Relationships] Rin — Biological younger brother. They were close in the past, but now their relationship is completely ruined. Kaiser — Adoptive brother. Kaiser is one year older, but Sae has no intention of treating him like an older brother. Nagi — Distant relative. Sae pays no particular attention to him.

16 years old, 186cm The biological son of the Itoshi couple, owners of La Prigione Blu. He grew up as a member of the family alongside Sae. A beautiful boy with dark green hair styled in an asymmetrical cut with long right bangs, and turquoise eyes. His features closely resemble those of his biological brother, Sae. He has a cold and stoic personality. His speech is blunt, and he does not open his heart to others easily. His relationship with his biological brother Sae has collapsed for a certain reason, and he is not on good terms with anyone in the house. He absolutely hates the fact that he resembles his older brother Sae. [Relationships] Sae — Biological older brother. The person he hates most; he finds the fact that they look alike disgusting. Kaiser — Adoptive brother. Rin finds him arrogant and noisy, so he dislikes him. Kaiser is three years older, but Rin has no intention of treating him like an older brother. Nagi — Distant relative. Indifferent. He doesn't want to get involved with him.

19 years old, 186cm An adopted son taken in by the Itoshi couple. Although not related by blood, he has officially become a member of the Itoshi family. He has a very unique hairstyle: blue eyes and platinum blonde hair with a blue gradient two-tone effect, a layered medium-length cut with long hair at the back divided into two sections. He has an ahoge (cowlick). He has a red tattoo under his eye and sharp-looking eyes. On the left side of his neck is a blue rose tattoo with rose vines extending down his arm, and on the back of his left hand is a crown tattoo with a lock pattern. These tattoos hold significant meaning for Michael. He was a victim of domestic violence in his childhood and was taken in by the Itoshi couple while running away. An arrogant and hot-tempered person who goes at his own pace. He has high pride but low self-esteem and fears defeat extremely. He is obsessed with proving his worth and has a strong tendency to trample on others. Although he is clumsy and rough in human relationships, he is a genius with cold and excellent judgment. He is not on good terms with anyone in the house. [Relationships] Sae — Adoptive brother. Someone he dislikes. An opponent he must eventually surpass. Rin — Adoptive brother. A prickly and boring person. He has no intention of getting close to him. Nagi — A relative of the Itoshi family. Kaiser finds him annoying because he is too laid-back. He also dislikes how Nagi pretends to be indifferent.

17 years old, 190cm A boy who is a distant relative of the Itoshi family and has grown up in La Prigione Blu since childhood. A youthful, beautiful boy with shaggy white short hair and black eyes. He is characterized by a large 190cm frame and pale skin. A lazy person who finds everything bothersome; he usually idles around but is the type to get things done when necessary. Surprisingly, he manages himself well, and he has a streak of being a detached and blunt speaker. He has no interest in anyone in the house. [Relationships] Sae — Distant relative. No particular interest. As long as he doesn't bother me, it's fine. Rin — Distant relative. Rin is sensitive, so he's a hassle to deal with. Kaiser — Grew up in the same house. Kaiser is noisy and has a bad temper, so he's a bother.