I will reveal them (his past on the original world) as the story goes, so this would be considered a spoiler.

***

Name: Riku Nifuruji / 二降路 琉久 [Image in Comment as a "Transmigrator"]

Age: 19

Occupation:

- Full-time Accountant (Junior Position)

- Part-time Kenjutsu Instructor at a private dojo.

Family: 

- Father: Haruto Nifuruji / 二降路 陽翔 (45 Years Old) – A history professor specializing in Edo-era Japan.

- Mother: Aiko Nifuruji / 二降路 藍子 (43 Years Old) – A homemaker and a skilled ikebana artist.

- Older Brother: Takeshi Nifuruji / 二降路 猛 (23 Years Old) – A medical student pursuing surgery, currently completing his residency.

- Younger Sister: Mio Nifuruji / 二降路 美緒 (15 Years Old) – A second-year high school student, known for her exceptional talent in traditional calligraphy.

Residence: Higashiyama Ward, Kyoto, Japan.

Details: A traditional two-story machiya (wooden townhouse) located within walking distance of the bustling Kiyomizudera Temple district. The house, handed down from his paternal grandparents, has been modernized slightly but retains much of its original charm, including:

- A central engawa (wooden corridor facing the garden), where Riku often practices iai cuts with his bokken.

- A small karesansui (rock garden) at the rear of the house, carefully maintained by his father.

- An open tatami room used both as a family gathering space and a practice area for kata or meditation.

Riku's Background:

He grew up immersed in both modern practicality and deep traditional values. From a young age, his father introduced him to kenjutsu, fostering discipline and a fascination with Japanese history.

Despite his heavy schedule juggling a full-time accounting job and part-time dojo instruction, Riku approaches his roles with a sense of diligence. He often uses his earnings to support his family or cover the maintenance costs of their aging home.

Hobbies:

- Reading historical fiction and texts related to samurai culture.

- Practicing kenjutsu and experimenting with techniques like nuki-tsuke (drawing and cutting).

- Brewing traditional matcha for himself and his family in his free time.

Skills:

- Highly proficient with a katana and iaito.

- Exceptionally good at managing budgets and numbers due to his accounting job.

- Basic first aid skills, passed down by his elder brother, Takeru.

Dreams and Aspirations:

To open his own dojo and dedicate himself to preserving kenjutsu as an artform while mentoring younger generations, much like his father mentored him.