Naois' flute (Garo: Goldstorm X Liberation Dx2)

Garo info

The Garo Franchise is the collective term for the Japanese Tokusatsu series created by film director Keita Amemiya. The first main series Garo was broadcast in 2005, with subsequent specials, sequels, spin-offs, and films released in the following years. The Garo franchise is noted for being more of an adult-oriented form of Tokusatsu entertainment, blending in elements of Horror, Fantasy, and Mythology to its story and world-building.
The general overview of the franchise's world-building and lore centers around the on-going war between the demonic beasts called Horrors and the Makai Knights; sworn protectors of humanity. The main focus of the story involves the titular Garo, The Golden Knight, considered as the strongest Makai Knight, and his battles against the Horrors.
This story takes place in the 5th Garo TV series, Garo: Gold Storm Sho.

The series is about the Makai Knight Ryuga Dougai (Garo) and Makai Priestess Rian are assigned under the Makai Priestess Lady Ryūme as guardians of Line City, investigating a mysterious increase in Horror activity in the area. The pair is also tasked with the recovery of the mysterious Hoken Sword, split into two daggers.
However, several players are also in the hunt of the daggers, including the Horrors Jinga & Amily, as well as the lone Makai Priest Gald.

what are Makai Knights?
Makai Knights are a group of specially trained men adept in martial and magical arts that battle Horrors. Founded by the secretive Makai Order and regulated by the Watch Dogs, the knights secretly patrol their respective territories to protect civilians from Horrors. Armed with special magical equipment, the knights carry an oath to maintain the light over the darkness in the Makai Realm.
The Order required self-sufficient warriors that are highly adept in martial arts (stronger than their priests and greater combat strength against Horrors), strong mental and emotional discipline (to handle their emotions, manage against potential dark energies, and see through illusions), and mastery over Soul Metal (due to its dangerous nature); creating a full-fledged Makai Knight is a lifetime of training. It's a common occurrence for a woman of their world, usually, a priestess, to marry a knight. Once they start a family, their children's sex determines their roles within their culture. If it's a girl, they will be raised and trained as a Makai Priest because males are physically stronger than females, the order decided to exclude women from ever becoming a knight. If it's a boy, they have the choice between becoming a priest and/or knight. However, it's also based on the decision of the parents and/or relative to their natural talents. For those that choose neither, they have the choice of living the secluded makai life or a normal civilian life, provided they don't expose their culture or face prosecution.
The first considered candidates are young boys from their order, usually the sons of Makai Priests and knights. It was done this way to ensure loyalty as well as secrecy from public exposure of their order; the selection process isn't exclusive to people within their order. While it is preferred to train a son of their order, orphans and/or those who have suffered by the hands of Horrors are allowed (under the instructor's own discretion) to be trained as well. However, those who have established themselves within the order are documented and archived with their personal information as well as their lineage to keep track of their activities. Training to become a knight has multiple options and paths: boot camp, dojo training, apprenticeship, and/or private training.
Once a Makai Knight, the order will assign each knight to a specific territory (or district). Each area is only specific to them and other knights are not allowed to cross into neighboring zones and interfere in another knight's business without consent. Each zone also has a Watchdog, it is they who delegate missions and commands from the upper-hierarchy to direct the designated knight (relative to their experience, skill, and abilities) with an Orders Document. Should a knight require disciplinary action, a watchdog has the power to detain and potentially kill the knight if necessary. However, there are also roaming knights. In terms of lifestyle, a knights' life is a high-risk occupation as well as a lonely one. Due to the exclusive culture of the Makai realm, members of their order often maintain an invisible social separation between normal people and people of their world. Even between members within their order, it's common practice to react with suspicion and hostility without proof.
While not fully explained, there are two unofficial classes of knights: the titled and titleless. Based on observation, titled knights are better respected, held in higher esteem than their lesser counterparts, and utilize a more specialized set of equipment. Knighthood doesn't guarantee a title; all knights gain a title in connection to the armor they're given but also based on the armor's design. The Order mass-produced a standard armor design for their corps (different in only gold, white-silver, and bronze colors) called Hagane Armors. The most exceptional and talented become titled, they have special armor that stands apart from the other knights. However, makai society is conservatively traditional as they still practice the birthright of inheritance; a lesser talented knight could inherit a powerful armor set simply because they're luckily high-born. Although biased and unfair, their armors possess a rich history and those famous deeds carry weight and great expectations to the heir of that title.
Unfortunately, lesser-achieved knights along with their standard armors aren't as well-regarded. They live in more simple settings and less compensated for their troubles. Due to having less specialized and less sophisticated equipment, they have to improvise and their own survival rate might be lower as they are less equipped compared to the titled. However, titled knights carry the most difficult and dangerous missions. Due to their hazardous career and pedigree, they're well-compensated for their missions (evidence of their personal estates and extravagant properties). Interestingly, the knights never quarreled over such differences and only focus on their mission against Horrors and show respect the most accomplished amongst them, such as Garo.
The average knight's career is approximately 30 years or roughly ending around their 50's (if they didn't get killed by Horrors). By then, the knight's body has grown old and strength has declined. Either the knight continues to fight until he's no longer able to or he'll forfeit his title for a younger knight to inherit his title, usually a son and/or disciple.