Isao Kusanagi is the 54-year-old owner of the biggest detective agency in Gifu City. He's famous for being really good at solving tough cases, and he sometimes bends the rules if money is involved. Even though he acts tough, he deeply cares about his son, Sōsuke Kaburaya. One of the most important parts of his story is when he helps Sōsuke and Sara Da Odin solve Sara’s legal identity issues, showing how family means a lot to him.
Isao Kusanagi is a 54-year-old man who looks strong and confident, fitting the image of a detective boss.
Isao’s favorite hobbies are drinking, gambling, and spending time with women.
He has a bold and sometimes reckless way of doing business, accepting even illegal jobs if they pay well.
Underneath his wild attitude, he is not an evil person, just very focused on making money.
He is smart, adaptable, and able to accept strange things, like when he learned Sara Da Odin was from another world and wasn’t shocked at all.
Isao Kusanagi leads the largest detective agency in Gifu City.
He sometimes does investigations himself and is known for his top-level detective skills.
He is Sōsuke Kaburaya’s real father but is already divorced from Sōsuke’s mother.
Even after he and Sōsuke argued and Sōsuke cut ties, Isao still looked out for his son.
He is proud of Sōsuke and believes he is the best detective in Gifu.
Isao is a very skilled detective.
He can find out everything about a person’s past, even tracing Sara Da Odin’s steps perfectly, back to the day Sōsuke first met her.
He is not afraid to go undercover, like when he pretended to be a customer at the club "濃姫" to gather information.
Isao is Sōsuke Kaburaya’s father.
Even after fighting with Sōsuke over business, and being disowned by him, he continues to care about him.
He trusted Sōsuke as both a son and a detective.
When Sōsuke asked for help with Sara Da Odin’s identity problems, Isao agreed to help for a simple price: Sara just had to call him "dad."
He then found someone able to forge birth certificates and other documents for Sara.
After Sara’s legal troubles were gone, Isao happily accepted Sara as his granddaughter.
He first met Livia Do Udis while investigating at the club "濃姫" as an undercover customer.
Risky Business
Isao runs his detective agency with an unusual style.
He will accept almost any job, even if it is illegal, as long as it brings in money.
Investigation Skills
Isao is not just the boss—he sometimes works as a detective himself.
He’s so good, he can follow a person’s history with amazing detail.
When it comes to Sara Da Odin, he traced her life story all the way to her first meeting with Sōsuke Kaburaya.
Undercover Work at the Club
For one case, Isao disguised himself as a guest at the club "濃姫."
He did this to learn secrets about a target and met Livia Do Udis during this mission.
Family and Forgiveness
Isao and his son Sōsuke Kaburaya do not always get along, especially because Isao’s business style is not always honest.
After Sōsuke stopped talking to him, Isao never stopped worrying about him.
He truly trusts Sōsuke as a detective.
When Sōsuke came to him about helping Sara Da Odin get legal documents, Isao helped right away.
The only thing he wanted in return was for Sara to call him “dad.”
Becoming a Grandfather
Once Sara’s legal problems were fixed, Isao accepted Sara as his granddaughter.
Isao’s business is the biggest detective office in Gifu City.
His easygoing and playful behavior hides his sharp mind and detective skills.
He is very open-minded, easily accepting that Sara Da Odin is from another world.
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